LoL, Dota2 or Heroes of The Storm?

If you don't like MOBAs, don't play MOBAs.

Like Malkev already mentioned, MOBAs can be fun if you play with friends. Especially since the MOBA community in genereal is just...cancer. Been playing LoL for 5 years and I cannot stand playing with random people anymore, too much headache. So I'd suggest you grab some friends and try each of those games you mentioned with them. Or you could take a look at Smite ;)

Smite/Supernova

I'm not particularly good at MOBAs but these are fun with friends.

Supernova very early stages though and it's sci-fi tinted, by Bandai Namco.

HOTS -> More Action, Matchs shorter, More Casual

For me: Dota 2 > LoL > Strife > Smite > all the ones I haven't played > HotS.....HotS is just pure casual cash-grabbing, it wasn't even fun after a few games, but all of this depends on what you prefer. Dota 2 is like the chess of MOBAs, the kings game, HotS on the other hand is way more for MOBA newbies and those that don't wanna invest time and soul into a game, because it's simple to learn.

Also Dota 2 for me is the only MOBA game that gets more fun the longer you play them, while the others have a higher starting fun, but it gets down fast depending on how complex they are.