Cord management they all have the one touch automatic cord rewind foot pedal
Dust-bin capacity they all use the same filter bag with the same 4.5 litre capacity
Noise level they all have the silent system with a noise optimized motor and integrated sound insulation
Status indicators (battery, bin, filter) they all have an indicator to let you know when that bag is full
Status indicators & maintenance alerts those same C threes also happen to be the only ones to have an indicator to let you know it's time to change the filter
Suction power (air watts) they all have the same 1200 watt motor and should technically have the same suction and air flow power specifications
Just Okay
Attachment variety & compatibility Calima and Alize have the socket but not the electric tube and so they only come with suction based attachments