SNES all the way.
Nintendo has always focused on making family games, as for Sega, they have made games JUST for the money.
Where has it got them?
It got Nintendo to be the BIGGEST gaming company currently going.
It got Sega...nothing, seriously, they don't even make gaming systems anymore.
So, SNES is definitely the best.
What does Sega have anymore? Sonic. what does Nintendo have? Mario, Zelda, Kirby, Starfox, Metroid and Donkey Kong.
See the difference?