As with most answers..it all depends on what you want to do, and also where you want to practice. If you'd like to stay in academics, then training with the most renown names is better, since you can use them to network and get a position. If you're geographically restricted, then training in the program in your desirable geographic location is better IMHO. Given that this is such a competitive fellowship, in the end getting into a fellowship is better than no fellowship at all...and I know of few people who had more than one fellowship offer.
And the experience of a dermpath fellowship as a pathologist differs on the institution, given how much exposure you'll get in dermatology clinic..everything from virtual "shadowing" to being on your own as a de facto resident. I think that the dermpath experience differs too, regarding how much time you have with attendings, how much preview time, and also the dermpath volume and variety.
Given that there are markedly fewer positions than candidates, take whatever you get. And if you have the opportunity to choose between multiple offers, then weigh them considering your future practice goals.
As for the inevitable "ranking" question, I would suggest a ranking hybrid of not only the "notorious" dermpath attendings but also in conjunction with the best dermatology departments (since training is split between the two areas).