Can't say I got much play into it as I just tried it for five minutes before I had to leave for work.
As far as I know, I find myself preferring the Predators, though the humans are pretty much middle range imo, balanced but nothing special or extraordinary. They do however have the weaponry and equipment that you may recall from the old films.
the Xenomorphs pretty much have to be up close to kill.
Predators however are fun in their own way as far as I've seen.
as for the info...
Aliens vs. Predator is a science fiction first-person shooter video game in development by Rebellion Developments, the team behind the 1999 original PC game, and set to be published by Sega for Microsoft Windows, the PlayStation 3 and the Xbox 360. The game is a first-person shooter based on a combination of the characters and creatures of the Alien franchise and the Predator franchise. It is to be released on February 16, 2010, in the U.S., and on February 19, 2010, in Europe.
Demo for now but it's releasing soon.