I believe it depends on the popularity of a character and the movie as well. Zerker is starting to sell out and IMO the movie Predators
is better than Predator 2, let's face it, P2 with Danny Glover was just awful and almost destroyed the franchise. The reasons I believe P2 Elder is so popular is that 1st: his headsculpt
and accessories were very cool. 2nd: Even if it was a small role it was a very significant one! He was obviously the leader, he tossed the dated handgun to Glover wich gave us a clue as to how long they've been hunting and observing humans. Yes, Elder P2 is going to be more popular than Guardian now and in the future.
I also believe that Zerker will eventually overshadow Guardian in popularity again goin back to the quality and popularity of the movie and character.
Years from now people will be watching Predators alot more so than P2, it's happening now infact! Zerker will sought after eventually more so in the future because people will have familiarized themselves more with him.
IMO, Zerker looks better too, infact, he looks kick-a$$!!!
IMO, Zerker will be a more wanted figure than Guardian, especially when eventually Zerker will be hard to find given his popularity in the movie
and being the 1st mold of a new breed of Prefator both in the movie and on the 1/6 world!