I really liked both, both systems had exclusive games that made them great but it's really not even debatable which machine had the legs, the SNES first-party lineup for that system was unbeatable.
SMW, Super Mario Kart, Donkey Kong Country series, Metroid, Super Punch-Out!!, A Link to the Past, Yoshi's Island, Starfox, Kirby, F-Zero, Pilotwings. Seriously - the first party games alone left a gap that Sega and their 3rd party devs couldn't hang with. This could be the entire SNES catalog and a lot of people would still call the Super the better machine.
Sega did real good with all the advertising about Nintendo being for the kiddies and the Genesis being for the teens - I bought into it. You'll see guys saying that same shit even now - "I don't want that kiddy crap, I'd rather play a game with huge ripped dudes beating the shit out of each other and rolling on the ground all sweaty and shit." It's just 100% douche to discount a system because it has some titles with cute characters.
I am glad that whole era is over, i loved game mags as a kid and every advert had brains, skulls, boogers, turds, stinky grandmas, weird looking creeps, puke, and blood in them.
All that said - SNES > GENESIS X10 - Even though I do like the Genesis. I've kept Ghostbusters, X-Men, and Ghouls N' Ghosts - I'd like to try Castlevania Bloodlines or whatever, but I'm not convinced it's better than either of the Super Nintendo offerings - Castlevania IV was the motherfucking bomb.