I say league of legends, first it's bigger than Dota from what I've seen and its just more played by the public, this just means most likely some of your friends either heard or play it, also I'm not a big Dota guy but all I know is that they have the same concepts obv, but I've heard my friends ask if they wanna play league or even speak about it, I have never heard anyone ask me to play Dota or even install the game... ever... but gamewise I just think leagues better, I've been playing it for years and still am.