I can't follow this one. If it's a comfort issue then it depends on how they are installed, not the unit itself.
I have Autocom and Scala. Both are equally good at transmitting sound to my ears at speed and it it possible to install either without affecting comfort of helmet - but there are other issues.
Autocom does not need regular charging - Scala does
Autocom mic is permanently fitted on the inside of my helmet and stays in position when putting on and taking off. - Scala mic is on outside and I need to remember to tuck it up under the edge before putting on gloves, and repeat if I flip my helmet.
Scala Bluetooth dongle on outside of helemt generates wind noise at speed.
Autocom needs some disassembly of helmet to fit - Scala should be easier but only on helmets without a neck skirt. My Schueberth C2, BMW Sys 5 and wife's Sys 4 all need slots cutting in the skirt to fit a Scala.
Scala not so good on flip lids as it fits too far back and mic boom is too short. I beleive new units have longer boom but still have problem. In addition to having to remember to tuck the mic under every time, when the lid is flipped up for any reason the sequence is (1) take off gloves (2) move mic away to allow helmet to be closed (3) tuck mic back underneath (4) replace gloves. This is a real nuisance when you just want to flip the lid up at traffic lights to cool down, scratch chin, etc.