>>92
>superior cheat detection
>free
>better tournament system
>constantly improving
>quick engine analysis of the game
>analytics for seeing where your weak points are
>!!many!! chess variants
the tactics trainer is shit but they at least have an archive of chess videos and you can always use chesstempo for tactics - your money's better spent there then on chess.com
I'll admit chess.com's Chess Mentor is pretty nice for beginners if they can't attend a chess club, but not for long. Books are superior for anyone other than the absolute beginner, imo.