If it's based just on head sculpt, my ranking would be:
Comiquette>XM Studios>Yellow/blue PF>brown PF
I'm a little biased cuz I own the XM one now but the comi does have the nicest masked portrait IMO. It just felt a little undersized to me...1/5th right? The PJ PF was pretty good except the pjs just didn't do it for me. Brown PF has a nicer sculpt, base then the pj PF but the heads aren't there for me. I really love the sculpt on the XM one as well as the base and all the details so it gets my vote as the best wolverine overall...the comi is a close second if it weren't for the scale. This brown one would be pretty high if the heads were comparable to the XM one or the comi one.