HOTS is a team game, LOL is a single player game you play on a team. HOTS has a bigger barrier for winning at higher levels, if you do not have a premade, you are going to have a generally harder time compared to LOL at comparisons of the same skill level of a single player.

Whats better Dota or league?

DOTA 2 boasts a steep learning curve, while League of Legends is fairly easy to pick up on. So to sum up, a player who prefers slow and complex gameplay will opt for DOTA 2, while a player who prefers faster gameplay and simplified mechanics will opt for League of Legends. It all comes down to personal preference.