It's fine to bet on your favorite monster, but on the principle that the tortoise beat the hare, I'd say it's a sure thing that the mushroom will win. They may look like they're just sitting still, but they can pop up in no time flat unexpectedly. Matango Andretti!
Naw, Mu's the dude in the kendo outfit (or scuba outfit, I guess). Zegaron's in it to win it. Look at that blood splatter. He ain't afraid to play dirty.