I go with League of Legends, even that for the most part the League community is toxic and childish as fck, the game is still great, very enjoyable and competitive for both casual and hardcore type of players. I've been on that game since I got closed beta access back in April 2009 and still loving the game 6 years later and what involves it (mostly eSports).
Have to mention that I started playing the MOBA genre thanks to DOTA, and I had a great time with it.
I've played A LOT of DOTA, DOTA2, Smite, Heroes of the Storm, Heroes of Newerth and other games that didn't get through the beta test such as Dawngate. Still, going with League.