Definitely Kinect Sports.
Mario Sports games sell well but not nearly on the level of Mario platformers. Kinect Sports, on the other hand, is a system seller for the 360.
Even at my most biased, there is no way that I can spin it to look like Mario Sports Mix has a chance.
Proud member of the SONIC SUPPORT SQUAD
Tag "Sorry man. Someone pissed in my Wheaties."
"There are like ten games a year that sell over a million units." High Voltage CEO - Eric Nofsinger