I picked Masks because I think it's a genre where pbta really works. You can't quantify Superman versus Batman. Otherwise, Superman wipes his ass with Batman 10 times out of 10. It's the squishy narrative (like pbta games) where this genre works best, IMO.
Masks is very good at distilling the supers narrative into a refined, hero-centric universe.
I'm not at all sold on pbta for dungeons (i.e. dungeon world, which is highly regarded), but I feel like Masks hits a sweet spot for the game engine.
(If I played Savage Worlds, I'd probably say similar things.)