Samus Aran on 13 March 2015
I've never played a Sonic game except the demos of Lost World and Boom. I did watch an entire let's play of Sonic Colors, Lost World and Sonic Boom.
Sonic Lost World demo wasn't bad actually. Sonic Boom was horrible.
Gamewise Mario is definitely much better. Mario has no character (except in the Paper Mario games perhaps, yet to play one of them), so it's impossible to compare these characters based on their personality.
