In middle/high school I was the biggest Genesis fan on the planet I reckon. The Gabriel-era of course, although the early records with Phil Collins in front (before Abacab) are good records. Actually, I don't mind the later stuff either up until the last one without Phil. We Can't Dance was not a prog record, nor was Invisible Touch, so it doesn't matter.
Anyway, I tried getting into Yes, but never found them as interesting as the Gabriel-era Genesis. I did like Gentle Giant though. It just seemed to me at the time that every other prog band I listened to were "doing it just to do it" if you know what I mean. Genesis always seemed to be doing it because that's the music they HAD to create together. The records just sound natural, like they were meant to be that way instead of forced.
It's weird, I know.