After playing the game (AvP Gold) with 9 friends reinacting the movie.. it came up that Preds won (No suprise) Aliens are pure speed, but the only tactic they have in an open field is running, crawling on the sides of the building and getting in 2 or three wacks of their tail, and that's hard with 3 preds and 3 marines looking to go hunting. Marines... well they're cannon fodder.. they have big guns.. easily avoided. a single tail hit and boom they're gone. Preds get pistols, spearguns,etc and that darn little tracking disk! Bah!
One hit kills on either species, simple and effective.
I say preds win the movie.
Edit:Can't wait, I'm going to San Diego on the 13th, but I'm going to see it Saturday or Sunday.