This was one of the first video games I ever got and now even though I have PS2 and Gamecube I still go back and play it over and over again.  I mean, nintendo couldn't have made it better.  There are tons of power-ups, secret levels, and different colored yosiis each with their own special powers.  In my mind the super nes version is much better than the GBA because you have to earn the right to save and it isn't a piece of cake to get a special colored yosii.  This has got to be one of the best mario classics of all time!