AvP: R.
The concept behind AvP was better ... but the follow-through is what's important. I didn't expect anything better from Paul Anderson. AvP: R had more action and more violence ... now, those don't make a good movie and in this case, it's definitely true. It didn't make it a good movie.
It certainly more entertaining than AvP, however. AvP had all the terrible acting and dialogue and story elements of AvP: R ... but with no gorey exploitation. Plus, AvP: R had a way, way better Predator.