I mean, ive played some dota in the past, i have about 200h on it, not nearly as much as league tho. But IME, especially for solo, league is just nicer overall. The mechanics for champions seem a lot more polished these days, and it is a lot more action focused, you have to worry about macro much less. The games are also like 50% shorter in league. As a solo player I find league to be a lot more laid back, where I can just play the champ more than play the game, if that makes sense.
To each their own of course, Im not saying one game is better than the other, but it is a hard sell to transition league to dota.