My commute is 9km and I wear bibs mostly because I've never found a saddle that I could ride on for 30 minutes each way, 5 days a week without some sores developing. No issues with bibs though.
Also coz cat6
Unrelated, on my old bike I used to ride in the lowest gear only so that I wouldn't arrive sweaty, it was 39/25 or whatever and about 5km. Any downhill you have to coast, on the flat/hills you're limited to a certain speed by cadence. Only way to stop myself sprinting everywhere
My commute is 9km and I wear bibs mostly because I've never found a saddle that I could ride on for 30 minutes each way, 5 days a week without some sores developing. No issues with bibs though.
Also coz cat6