I just tell myself that they are all opinions and not based in fact and the poll is okay. I personally think the Genesis is better than the SNES for many many things despite the color limitations. The fact Sega didn't have to essentially add new hardware to the carts themselves like the SNES and still got comparable results is pretty telling to me.
I go the other way for a few reasons.
First off among exclusive (for the generation games) there aren't a whole lot of Genesis cartridge games I define as great. Warsong, Phantasy Star II and IV, Streets of Rage II, Castlevania Bloodlines, Sonic 1-3, The Genesis version of Aladdin and El Viento.
When I compare that to the huge slew of games exclusive to the SNES for that generation I consider to be great Mario World, Yoshi's Island, Zelda 3, Super Metroid, Final Fantasy II, Final Fantasy III, Chrono Trigger, Earthbound, Super Mario Kart, Mega Man X, Kirby Super Star, Super Castlevania IV, TMNT Turtles in Time, Contra 3.
Generally though not universally I've found that games available for both platforms wound up being a little better on the SNES. There are some exceptions but more often than not that's the case.