It makes no sense to say that LoL is easier than Dota 2. Both are PvP games.
However LoL is pay2win so it's not really free. In fact it costs a lot. Much more than you'd expect a game like that to cost, even if you only unlock the content that tangibly affects your chances of winning (no skins, summoner icons etc).
I too would avoid the genre unless you think you have more free time than other people. These games can be extremely time consuming - in order to beat the people who basically play all the time (some for a living) you likely need to play a lot as well unless you are exceptionally talented.