I don't really see how it's biased to have an Alien get the jump on one Predator, and then legitimately beat another in a fight... I guess it's just so different from what everybody was used to seeing in the games and comics. I do agree that it should have been done much better, perhaps spacing them out and having them a few minutes apart.
Anyways, I think I've said this before, but between these two, I'd pick Anderson. At least I know he's capable of making a good film (Event Horizon), even if the majority of his films are shit.