I think it's unfair to compare certain games like Aladdin, Animaniacs, and Sparkster to name a few. Because these games were completely different from one another with different gameplay features... there was no porting involved. Take Aladdin for instance. The Genesis version was done by Virgin Interactive with Al jumping around with a sword, and the SNES version was done by Capcom with Al bouncing on enemies and throwing apples. Hence, you have two completely different gameplay variations, and thus incomparable games. And personally, I like both of them. However, games like The Lion King are indeed comparable because they were developed by the same company and share the same gameplay features... so are, henceforth, the same game on both systems. Speaking of that, my vote goes to the SNES version. Better sound, better sound effects, better music, more vibrant colors, better voice. It just beat the holy crap outta the Genesis version. For example, look at the endings. At the end of the SNES version, the screen turns black and The Lion King title explodes into view in a loud BOOM... just like the movie. In the Genesis version however, the screen stays with Simba on Pride Rock, and then The Lion King title just kinda appears above him with a sound that resembles a cardboard box being dropped onto a carpet rug. SNES wins... it displayed much more power.
As far as sports games go, I can't see how EA Sports games were better on Genesis. I've played both, and SNES versions have much better sound and better features... not to mention a MUCH better controller with more buttons. Come to think of it, I can't think of any games that were better on Genesis unless they were exclusive to the system... and that's pretty much the reason I bought a Genesis... to get the games I couldn't own on a SNES. The only reason I own any Genesis sports games is cuz I got them in an ebay lot. Didn't really want em, but I wasn't gonna turn em down... although I do like Sports Talk Baseball and Football... but those aren't comparable cuz they weren't on SNES.
Not to knock the Genesis or anything, as it's a great system. I just always turn to the SNES's superior graphics, sound, and controller when playing games that were on both.