Personally, I have no dog in this fight being that I love the SNES and the Genesis equally. I've never really considered one or the other to have superior graphics or sound; it all depends on the game.

I can say this in favor of the Genesis though. Listening to a clip on youtube or a snippet captured through emulation just isn't the same as having your Genesis plugged into an actual stereo that is (1)decently set-up, (2)playing back in genuine 2 channel stereo, and (3)having speakers that can actually move some bass.

If I was just going by the majority of the posted examples, I would feel that the SNES had better sound. But if you play them both back through a hi-fi set up, the Genesis has usually much more resonant bass and a "warmer", less synthetic sound compared to the SNES. The best way I can describe the two is that the Genesis is the equivalent of the analog disc- warm, better rounded, and with a punchy bass. The SNES reminds me of the earliest CDs; crystal clear, but almost to a fault.