The big argument with selecting the all-stars each year has to do with rather stats should override a teams winning percentage. In otherwards, should you penalize a guy whose having an all-star caliber year, for being on a losing team (even though, in many cases, it's entirely not their fault)...
BJ "the Prodigy" Penn or George "Rush" St. Pierre. They both have improved tremendously since their last fight so right now I don't know who I would pick if I was a betting man.