Thomas Shey
Legend
What do you want from your TTRPG?
HERO'S rules are about accurately representing superpowers, modeling superheroes, and combining them in whatever fashion you want.
Monsterhearts' rules are about conflicts derived from relationships, personal ethos, and High School drama.
Now that I think about it, combining these rules sets would be feasible...
Which was my point. You could make an argument it could go other way, but I'm willing to bet I could get a hybrid that combined the two starting from Hero and make it work a lot faster than the other way around.
(Note: this may not be true for those who don't require strong engagement with the combat element, but I'm assuming that is, in fact, part of what one wants or you could probably just hybridize Monsterhearts and Masks).