I would have to say hands down: SNES.
While both systems had it's strength and weakness, but I think Nintendo played better in that arena. I just didn't like Genesis darker colours, don't get me wrong, they had a lot of awesome games, as one of my favorite, Gun Star Hero's, Shining Force series, Phantasy Star, and many more.
Where as SNES had better hardware, heck, it wasn't impressive what they pulled out of a 16 bit cart. Star Fox alone was impressive, and then when they started getting into 48 cartridge, such as Tales of Phantasia. Plus, the sound system was down right impressive.
This will be my best console of all time, but, I can't knock some of the others as well, tho.