Which factors in PostDoc opportunities choice?
Actually, I think the frame of this question isn't quite right. I would argue that these are criteria that I would use if I were choosing between multiple postdoc offers, but these are not necessarily appropriate when deciding where to apply.

What I would do is decide what my "deal-breakers" are: that is, what are the criteria that would prevent me from accepting an offer, regardless of how good it is? For instance, if you need to take care of an ill family member that lives in a specific location, then you're probably not going to want to consider international programs. Similarly, if you're determined to go into industry, you're not going to be inclined to take a purely theoretical postdoc project.

However, once you've decided upon those deal-breakers, if you then see a project for which those criteria do not apply, then you should go ahead and submit an application. You don't have much to lose by doing so.

Once you have the offers, the challenge is tougher. All of the criteria you've listed are valid, and it's hard to say which of those might be the most important—it all depends on your own personal circumstances. One hopes that research concerns are the most important of all, but as I've mentioned above, there are valid reasons why that might not be the case. The only thing that I would make sure of is that whatever option you decide for in the end, it helps you in moving on with your career beyond your postdoc. There's nothing worse than getting stuck in "PD purgatory," where you can't really stay as a postdoc any longer, but are having problems moving to a permanent position afterward.