This is an awesome setup and great way to even things out here. I'm gonna go with the earth heros here though. They have more diversity to their fighting and abilities(flying, teleportation, etc) plus their weapons seem more lethal then the norm(laser knife glove, land mines, etc). And finally the coup de grace.....I'll probably sound like a fanboy here, but they have Batman. His skills are legendary enough but he fought the Predator race before( http://en.wikipedia.org/wiki/Batman_versus_Predator ). With his prior experience and mind plus the Questions IQ, these guys have it in the bag. Earth heros ftw!