The above post is exactly right. Save the skin suits for time trialing, wear what you like on regular or training rides.
I only wear Castelli Aero and Body Paint bibs, but those are my preference. I like the fit, seam quality and the compression they offer. I have some old shorts I'll wear when I hop on my indoor trainer and they feel weird to me--I'd never wear them out on the road.
Just for the love of god, guys, please replace your shorts when they're so worn they become sheer. I like a sweaty ass crack as much as any guy here, but there's something wrong about having to stare at one in a paceline when you're behind some guy whose shorts are about as concealing as a screen door.