For what it's worth, I'm not trying to take credit for Pred tech away from them, or discredit Predators at all. I was a Predator fan before I ever saw an Alien movie. But, given what is shown of them in official media, we don't really have any indication they have the ability to 'wipe out planets' or exterminate entire species as has been suggested over the last couple of pages. I was simply playing devil's advocate and showing that you could just as easily extrapolate Predators being pretty lacking in such capabilities based on the same core evidence.
As far as the actual question this thread title asked, I can't really pick one over the other. Both feature in stories I love, and stories I wish I'd never been exposed to. They're very different in some ways, but both stem from an original story where they're essentially a slasher movie villain. Both Aliens and Predators have been portrayed differently over the years and I don't much care for some of those portrayals.
But AvP couldn't exist without both creatures, and AvP stories can't really be good if you fail to portray both creatures as absolute killing machines. Requiem showed us what happens when you fail to give credit to one of the participants in that central conflict. The concept loses its steam. This isn't to say they're equal in all things - there are obvious asymmetries - but they should be portrayed as equal in terms of threat, or else there's no tension in the battle at all.
As for the Predsuit, I'm of the opinion it was designed as a deliberate mockery of the studio's requests to Shane Black.