I really prefer the Mario games, but I also really enjoy Sonic's games. I got loads of fun out of Sonic Generations for sure. =) But if we're only counting Marios 1-3 and Sonics 1-3, then I totally prefer Mario. Mario Bros. 2 and 3 are both marvelous games, and I really only enjoy Sonic 3 out of the first 3 sonic games! xD That's counting Knuckles, btw.