Skinsuit for racing only. Aero and far more comfortable than bib jersey combination (N=1 Cuore)
IMO should never be worn other than on the bike mid race or podium afterwards. Your local cafe customers don’t need to see how lean or otherwise you are.
If your only buying one option, the bib and jersey is definitely more versatile. I only wear bibs on the trainer… a skin suit would be a hot option.