League of Legends on the other hand add a bit of depth to the genre by giving customisation options to champions outside of the main game (runes, masteries, summoner spell). The learning curve should be smoother, as people need to reach level 30 on their "summoner" (account) before they can enter ranked games. They also need to "buy" at least 16 champions on order to participate in ranked games. This will force the player to learn a bit of the game before entering the competitive scene.
Currently League of Legends is definitely the most competitive MOBA (Multiplayer Online Battle Arena) game around and Riot invests heavily in keeping it that way.