My vote is for Epic Mickey. Disney is taking Mickey in a surprising new direction, and the gameplay looks fun and innovative. I find this to be a welcome change as the Disney Universe doesn't have a very established canon. The use of old and forgotten Disney characters is interesting as well.
Sonic Colors, on the other hand, just looks like another trite Sonic game. I've learned to distrust Sega in that regard as every Sonic game since Sonic Adventure 2 (so many years ago) has been, or at least looked, generally un-enjoyable. The new concept introduced seems, as they often do for the Sonic series, like it will either have little bearing on the traditional gameplay mechanic, or change it on unnecessary levels. New and confusing characters are introduced (a series as simple as Sonic has too many characters already), and it feels like it could easily wreak havoc with the Sonic canon.