While I'm not all that fond of the Green Hulk, I happen to like the Red Hulk much better. Check out this guys feats:

Owns Odin Force Thor with his own hammer

Absorbs Silver Surfers cosmic power and kills him

Punches out the Watcher

Kills the Incredible Hulk

Chops off Terrax's head with his own axe

Beats the crap out of an Elder of the Universe