Mario Vs. Sonic.

[~Axis~]

Same here. I will always love Sonic since It was the first game I ever played (and first anime I ever watched). However, if I had to choose, I would pick Mario, because almost every game in the series is a whole load of fun and makes you want to play it over and over again, while only one Sonic game can do that for me, S3&K. No matter how many times they rehash NSMB, no matter how boring the concept gets, I'll still have fun playing it. If I had to choose between characters and story though, I would definatly pick Sonic. There are much more personality in the characters in the Sonic cast than Mario. Plus the storyline of the Mario series is rather simplistic, while the storyline of Sonic is rather dynamic. Both of them have the same concept: chase down the bad guy, but Sega knows how to throw some story into the mix.