It's easy to play SFC carts on the SNES, a pita to play SNES carts on a SFC.
^^^
If you don't like the look of the SNES, there is always the option of getting a SNES Jr, which, personally, I like the look better than the bulky original. The only thing is, I think anyway, you can't use the Game Genie on the Jr. I have one and tried it, while I was able to enter codes and such, they simply refused to work. You can do the same thing with the Jr, pulling the tabs out to play SFC carts. Otherwise, you're gonna have a bit of a tougher time.