[Grim Tuesday]

A good defensive robot (treads, 6WD, or 8WD) should be able to push around a mecanum robot no problem. Depending on how they are set up, they MAY be faster. However, with any tank drive robot, if you want to score (atleast in this years game), you have to come onto the pegs perfectly: If your off, you have to backup and try again.

There are cases where one is better than the other. I don't feel that Mecanum could perform well enough against a good defender to account for its pushibility. But thats just an opinion.