Average score
Product 1: GravaStar Mercury V75 Pro
4.1
Product 2: Glorious GMMK 3 Pro HE
4.2
acoustics
Product 1: GravaStar Mercury V75 Pro
4.2

Reviewers describe the sound as clacky and generally pleasing, with one noting it is louder and more direct while others call it clean or good sounding.

Product 2: Glorious GMMK 3 Pro HE
3.6

Acoustic character is build-dependent; one reviewer found the sound divisive, while another liked the deeper thud from its damped setup.

actuation consistency
Product 1: GravaStar Mercury V75 Pro
4.4

Actuation and switch behavior are consistently portrayed as precise and responsive, with stable performance, accurate registration, and rapid actuation/deactivation noted across multiple reviews.

Product 2: Glorious GMMK 3 Pro HE
No score yet
analog input support
Product 1: GravaStar Mercury V75 Pro
No score yet
Product 2: Glorious GMMK 3 Pro HE
4.8

HE models are explicitly said to support analog inputs or analog response for compatible gaming use.

backlight brightness
Product 1: GravaStar Mercury V75 Pro
4.6

Brightness is strong where discussed, with reviewers calling the RGB bright and highlighting brightness controls in the web driver.

Product 2: Glorious GMMK 3 Pro HE
3.8

On at least one build, the backlighting was bright enough to illuminate the legends.

battery life
Product 1: GravaStar Mercury V75 Pro
No score yet
Product 2: Glorious GMMK 3 Pro HE
4.1

Battery life lands in a decent-not-exceptional range, with real-world reports from about 20 hours to roughly a week depending on use and lighting.

build quality
Product 1: GravaStar Mercury V75 Pro
4.6

Build quality is one of the keyboard's strongest areas, repeatedly described as sturdy, heavy, well-built, high quality, and aluminum-based.

Product 2: Glorious GMMK 3 Pro HE
4.7

Build quality is consistently praised, with reviewers calling the board very well-built, premium, and among the best they tested.

cable quality
Product 1: GravaStar Mercury V75 Pro
2.2

The included cable is a weak point in the one review that discusses it, because it is a plain rubber USB cable rather than a braided cable.

Product 2: Glorious GMMK 3 Pro HE
4.6

Included cable options are described as well-built, with thicker sleeving and braided or coiled premium-style construction.

compatibility
Product 1: GravaStar Mercury V75 Pro
4.0

Compatibility is generally positive for keycaps, Windows/Mac use, and select magnetic switch replacements, though switch compatibility still requires checking supported TTC and Gateron models.

Product 2: Glorious GMMK 3 Pro HE
4.5

Reviews repeatedly confirm support across Windows and macOS as well as broad compatibility with Hall-effect and traditional MX-style switch ecosystems.

connectivity
Product 1: GravaStar Mercury V75 Pro
2.2

Connectivity is limited because the keyboard is wired-only; reviewers treat the wired setup as functional but restrictive.

Product 2: Glorious GMMK 3 Pro HE
4.3

Wired USB-C, Bluetooth, and 2.4GHz options are repeatedly confirmed, though one review criticized unclear mode labeling.

customization options
Product 1: GravaStar Mercury V75 Pro
4.5

Customization is broad, especially around actuation, rapid trigger, lighting, remapping, profiles, and Hall effect features through the web-based driver.

Product 2: Glorious GMMK 3 Pro HE
5.0

The product's defining strength is deep customization, with reviews repeatedly describing it as exceptionally customizable.

desk space efficiency
Product 1: GravaStar Mercury V75 Pro
4.1

The 75% layout saves space versus full-size boards by dropping the numpad and full navigation cluster while retaining arrows and useful keys.

Product 2: Glorious GMMK 3 Pro HE
No score yet
durability
Product 1: GravaStar Mercury V75 Pro
4.5

Durability evidence is positive, with reviewers pointing to heavy-duty construction, high-quality materials, and long switch lifespan claims.

Product 2: Glorious GMMK 3 Pro HE
4.4

Thick PBT caps and related materials are described as supporting longevity in use.

ease of switch replacement
Product 1: GravaStar Mercury V75 Pro
4.7

Switch replacement is easy where discussed, because the Hall effect switches are hot-swappable and do not require soldering.

Product 2: Glorious GMMK 3 Pro HE
4.7

Switch swapping is consistently described as easy, breezy, or quick.

ergonomics
Product 1: GravaStar Mercury V75 Pro
4.1

Ergonomics are helped by adjustable feet or folding legs that change typing angle, though one reviewer found the feet visually unusual.

Product 2: Glorious GMMK 3 Pro HE
3.9

Comfort is helped by the typing angle and palm support area, though some builds may still benefit from a wrist rest.

extra gaming features
Product 1: GravaStar Mercury V75 Pro
4.6

Extra gaming features are a major strength, with rapid trigger, SOCD/LKP, DKS, mod-tap, profile switching, and advanced Hall effect functions cited.

Product 2: Glorious GMMK 3 Pro HE
4.9

Beyond Rapid Trigger, reviews mention Dynamic Keystroke, custom deadzones, dual-action key behavior, and other advanced HE features.

frame rigidity
Product 1: GravaStar Mercury V75 Pro
4.6

Frame rigidity is strong, with reviews emphasizing a heavy-duty aluminum or metal case, sturdy feel, and high-quality construction.

Product 2: Glorious GMMK 3 Pro HE
4.5

The aluminum case is described as premium and sturdy, indicating a rigid chassis.

gaming performance
Product 1: GravaStar Mercury V75 Pro
4.5

Gaming performance is consistently rated highly, with reviewers reporting smooth play, strong FPS performance, no obvious performance complaints, and fast response.

Product 2: Glorious GMMK 3 Pro HE
4.6

Across reviews, the board is described as strong for gaming, especially once Hall-effect features are configured.

hot-swappable switches
Product 1: GravaStar Mercury V75 Pro
4.6

Hot-swap support is clearly present where reviewed, letting users swap compatible magnetic switches without soldering.

Product 2: Glorious GMMK 3 Pro HE
4.9

The HE implementation allows hot-swap support and broader switch flexibility than many competing boards.

keycap quality
Product 1: GravaStar Mercury V75 Pro
4.0

Keycap quality is mixed: several reviews praise the PBT/PC materials and durability, while Tom's Guide strongly disliked the rough paint-like texture.

Product 2: Glorious GMMK 3 Pro HE
4.4

Keycap impressions are generally positive, with thick PBT or double-shot PBT caps described as good quality and pleasant in use.

key responsiveness
Product 1: GravaStar Mercury V75 Pro
4.5

Key responsiveness is a major strength, with reviewers describing instant key presses, feather-touch activation, ultra-fast response, and rapid registration.

Product 2: Glorious GMMK 3 Pro HE
4.6

In gaming use, key response was described as reacting very well once the board was configured.

key spacing
Product 1: GravaStar Mercury V75 Pro
4.3

Key spacing and navigation are mostly positive, with reviewers finding arrows and extra keys easy to locate and useful in the 75% layout.

Product 2: Glorious GMMK 3 Pro HE
4.7

One review specifically praised the key spacing for fast, accurate typing.

key stability
Product 1: GravaStar Mercury V75 Pro
4.6

Key stability is directly praised in one review, which notes stable switches with minimal wiggle or wobble.

Product 2: Glorious GMMK 3 Pro HE
3.6

Stability depends on build choices; one review praised reduced wobble, while another noticed play and wiggle in its plate and switch setup.

latency
Product 1: GravaStar Mercury V75 Pro
4.4

Latency performance is strong across gaming-focused reviews, with several noting no lag, low latency, or very fast measured results.

Product 2: Glorious GMMK 3 Pro HE
4.5

Core software exposes very low configurable input latency, with one reviewer noting it can be set as low as 2 milliseconds.

layout options
Product 1: GravaStar Mercury V75 Pro
4.1

Layout options are solid around the 75% form factor, variants, and configurations, though users wanting larger boards or numpads may still be limited.

Product 2: Glorious GMMK 3 Pro HE
4.8

The lineup is offered in 65%, 75%, and 100% layouts.

legend visibility
Product 1: GravaStar Mercury V75 Pro
4.4

Legend visibility is positive where discussed, with one reviewer noting the large themed legends remain very legible.

Product 2: Glorious GMMK 3 Pro HE
3.5

Legend visibility depends on the chosen caps; one review notes the selected keycaps lit the legends sufficiently.

macro customization
Product 1: GravaStar Mercury V75 Pro
3.2

Macro customization is mixed: one review says the web software can record macros, while another found no macro recording function at the time of testing.

Product 2: Glorious GMMK 3 Pro HE
4.2

Reviews confirm users can assign modifier-based or recorded macro actions to keys.

materials quality
Product 1: GravaStar Mercury V75 Pro
4.5

Materials quality is high, with repeated references to aluminum alloy, metal, full aluminum case construction, and sturdy high-quality materials.

Product 2: Glorious GMMK 3 Pro HE
4.6

The full aluminum build is a standout part of the product's premium feel.

media controls
Product 1: GravaStar Mercury V75 Pro
4.1

Media controls are present through a volume knob or lever, including mute behavior, though it is not always a traditional rolling knob.

Product 2: Glorious GMMK 3 Pro HE
2.5

The knob supports some media-related reassignment attempts, but one reviewer could not get their desired play or pause function working.

noise level
Product 1: GravaStar Mercury V75 Pro
4.0

Noise level leans clacky and noticeable rather than silent, but reviewers generally describe the sound as acceptable or good rather than harsh.

Product 2: Glorious GMMK 3 Pro HE
4.8

One reviewer called it one of the quietest boards they had tested in that specific configuration.

onboard memory
Product 1: GravaStar Mercury V75 Pro
4.0

Onboard profile support is only lightly evidenced, with one review mentioning onboard presets and profiles.

Product 2: Glorious GMMK 3 Pro HE
No score yet
per-key lighting control
Product 1: GravaStar Mercury V75 Pro
4.6

Lighting control is strong, with per-key RGB, backlighting, side lighting, and lighting controls noted across reviews.

Product 2: Glorious GMMK 3 Pro HE
No score yet
polling rate
Product 1: GravaStar Mercury V75 Pro
4.4

Polling rate is a high-spec strength, with multiple reviews citing or testing 8,000Hz polling, though one reviewer considered it more marketing than noticeable.

Product 2: Glorious GMMK 3 Pro HE
5.0

Multiple reviews confirm wired polling up to 8000Hz and describe that high rate as working without issue.

portability
Product 1: GravaStar Mercury V75 Pro
2.6

Portability is a weakness because the board is heavy, wired-only, and visually or physically bulky despite its 75% layout.

Product 2: Glorious GMMK 3 Pro HE
2.2

Heavy aluminum builds hurt portability and make the board harder to move around.

profile management
Product 1: GravaStar Mercury V75 Pro
3.9

Profile management is supported through presets and easy profile switching, though some layer behavior was described as limited or imperfect.

Product 2: Glorious GMMK 3 Pro HE
4.5

Core allows users to save and switch between multiple profiles.

rapid trigger support
Product 1: GravaStar Mercury V75 Pro
4.7

Rapid trigger support is a core strength, appearing repeatedly with fine adjustment ranges and advanced Hall effect behavior.

Product 2: Glorious GMMK 3 Pro HE
5.0

Rapid Trigger is explicitly supported and highlighted as a core Hall-effect gaming feature.

reliability
Product 1: GravaStar Mercury V75 Pro
4.2

Reliability is generally positive where discussed, with the keyboard feeling durable and a reviewer reporting no major issues, though minor double-clicking was noted as fixable.

Product 2: Glorious GMMK 3 Pro HE
1.8

One review reported a serious failure involving repeated keys and a dead board before replacement.

RGB customization
Product 1: GravaStar Mercury V75 Pro
4.5

RGB customization is extensive, with web software controls for lighting effects, colors, brightness, side lighting, and custom lighting behavior.

Product 2: Glorious GMMK 3 Pro HE
4.4

Core software lets users program RGB lighting behavior and effects.

RGB lighting quality
Product 1: GravaStar Mercury V75 Pro
4.6

RGB lighting quality is a standout feature, with praise for underglow, side lighting, bright effects, leg lighting, and the visual glow through translucent keycaps.

Product 2: Glorious GMMK 3 Pro HE
4.6

RGB lighting is described as generous and strong-looking, with good diffusion and visible accent lighting around the board.

size and form factor
Product 1: GravaStar Mercury V75 Pro
4.0

The 75% form factor is generally practical, balancing desk space and function keys, but some users may prefer smaller travel boards or larger layouts.

Product 2: Glorious GMMK 3 Pro HE
4.7

Reviews confirm multiple sizes, with the range spanning compact and full-size options.

software quality
Product 1: GravaStar Mercury V75 Pro
4.2

Software quality is mostly positive because the web driver is easy and feature-rich, but some reviews mention early quirks, language issues, or missing macro support.

Product 2: Glorious GMMK 3 Pro HE
3.3

Software is feature-rich but mixed in execution; several reviews cite bugs or barebones behavior, while others found current versions easy to use or improved.

sound dampening
Product 1: GravaStar Mercury V75 Pro
4.4

Sound dampening is well supported by foam layers, dampening pads, and case design that reviewers connect to a cleaner clacky sound.

Product 2: Glorious GMMK 3 Pro HE
4.5

Reviews directly mention dampening materials and note that the frame and internals help deaden keystrokes and sound.

stabilizer quality
Product 1: GravaStar Mercury V75 Pro
4.5

Stabilizers are positively described in the reviews that mention them, with reduced rattling/pinging and good stabilizer sound.

Product 2: Glorious GMMK 3 Pro HE
4.0

Stabilizers are described as lubed out of the box, a positive sign for the stock stabilizer setup.

switch feel
Product 1: GravaStar Mercury V75 Pro
4.4

Switch feel is generally praised as light, smooth, stable, and pleasant, though switch choice is limited to linear Hall effect options.

Product 2: Glorious GMMK 3 Pro HE
4.3

Reviewers describe the switches as more uniform than wobblier builds, with Panda HE switches also getting positive feel-and-sound impressions.

switch options
Product 1: GravaStar Mercury V75 Pro
2.6

Switch options are limited, especially for stock switch choice and for users who want tactile or clicky switches rather than linear magnetic switches.

Product 2: Glorious GMMK 3 Pro HE
4.8

The HE version is offered with multiple Hall-effect switch choices, including linear, silent, tactile, and clicky options in Glorious' lineup.

typing comfort
Product 1: GravaStar Mercury V75 Pro
4.2

Typing comfort is decent to good: reviewers liked the light switches and daily-use feel, though some disliked keycap texture or sensitivity settings.

Product 2: Glorious GMMK 3 Pro HE
3.6

Typing comfort is generally good, but some reviewers still wanted better angle adjustment or a wrist rest.

typing feel
Product 1: GravaStar Mercury V75 Pro
4.1

Typing feel is generally good or smooth, helped by light switches and sound tuning, but not every reviewer considered it great due to keycap texture or sensitivity.

Product 2: Glorious GMMK 3 Pro HE
4.6

Reviewers repeatedly say the board feels excellent to type on, with silky or premium-feeling key travel depending on the build.

value for money
Product 1: GravaStar Mercury V75 Pro
3.6

Value for money is divisive: several reviewers find the premium build and design worth it, while Tom's Guide and another reviewer argue cheaper competitors offer better value.

Product 2: Glorious GMMK 3 Pro HE
3.3

Reviewers widely note the premium price, though some still see the value as more defensible in light of the feature set and customizability.

volume control
Product 1: GravaStar Mercury V75 Pro
4.1

Volume control is useful and repeatedly noted, using a knob or lever that can adjust volume and often mute.

Product 2: Glorious GMMK 3 Pro HE
4.0

The rotary knob can control mute and unmute via press.

wireless performance
Product 1: GravaStar Mercury V75 Pro
1.4

Wireless performance is a clear weakness because the keyboard has no Bluetooth or 2.4GHz wireless mode and is wired-only.

Product 2: Glorious GMMK 3 Pro HE
4.6

Wireless use is described positively, with reports of stable connections and no noticeable lag.