The Best Way to Play Classic Sonic Games

All you need to know

Sonic Origins (available on Steam) with the Sonic 3 "Complete Music Restoration" mod, played with a controller.

Details

The modern "Sonic Origins" remaster (on PC and consoles) has some very nice improvements like sorely-needed widescreen support, but it also replaces several iconic tracks from Sonic 3 with some forgettable tracks. It seems to be because of some kind of music licensing issue. It doesn't ruin the game, but if you're playing on PC then "Complete Music Restoration" mod undoing this is a must, fixing the single major issue with the remaster.

The other ways to play the classic Sonic games would to play on an original console or on an emulator.