My vote went to Predator 2. Don't get me wrong - I love Predator! It's a bloody brilliant piece of sci-fi action. That being said, I've always found Predator 2 to be a bit more enjoyable to watch. It's a bit over the top at times - yes but it's such a fun, action packed thrill ride. Bonus for me is that I like Predator's 2 cast of characters a bit more then Predator's cast.
Predator - 8.5/10
Predator 2 - 9/10