(Please Excuse My Language In The Following Post)
Personally, I like them all, but this whole topic is nothing but opinion.
The Original 2 Predator films fit the whole "Alien Hunter" feel, and really pulled it off while making them look really cool at the same time.
I believe the AvP armor wasn't supposed to make them "teenage-like" at all, but to simply turn the preds into your stereotypical "Big Badass", which I don't have a problem with, because it too makes them look really cool, it's just not what we're used to seeing, which is probably why none of you like it, you're just not used to it.
Wolf's from AvP-R mostly brought back the original armor, but Wolf's personality gave him a more "Ninja Warrior" feel, and me being as obsessed with Ninja as I am, I like it, in fact I thought he was the coolest pred in all the movies. Ninja-like with two casters, a large arsenal including shurikens, kicking everyone from every species' ass all movie long, no doubt about it... Wolf is a Badass.