When I was quite young, I would play Mega Collection and SA2B. On the other hand, while I do quite like S3&K and SA2, my personal favorite, despite remembering nothing but faint recollections of one of the first cutscenes, is Heroes. In fact, that faint recollection is what got me back into Sonic, as I decided to play Classic Heroes due to seeing Espio, Vector and Charmy as being tip-of-the-tongue oddly familiar. I haven't really had a chance to play any of the modern games, though. Perhaps I'll buy the next game.