SNES is my favorite, too. I don't think that any other system has both the overall quality and diversity of its game library (Genesis probably has just as good of a library, but I think too many of its good games are arcade and sports titles) and excellent hardware (for its time peroid, at least) that the SNES has.
Bluemonkey makes a good point. When I bought my Dreamcast, I already had better versions of the two Sonic Adventures, Skies of Arcadia, and Crazy Taxi on my Gamecube, and I like those games better than most of my other Dreamcast games.
Actually when I generally see reviews of later versons of the original Crazy Taxi and Sonic Adventure on other systems they're generally scored very low. The general complaint seems to be that they were not at all improved over the Dreamcast versions which were out two years earlier, and thus deserve more respect than direct ports onto newer hardware which should have done better.