I was sad that SC2 was not BW in 3D and that proleague died so I switched to LoL. Then LoL came out with pre-season 3 and I stopped playing. Maybe I have outgrown games, maybe I just don't think either game is as good as their fan-bases think.
I'll admit that when I started playing LoL it was to relax after a BW session and it definitely felt easier for the individual, but there is a lot of it that's out of your control and I suppose that it is the unpredictability of the game that makes it interesting to watch.
If I had to say why I liked one more than the other it is because it's easier for me to follow 10 shiny things on the screen that two gigantic shiny blobs. It really is a matter of preference and you can say both are decent games. LoL is mainly more popular because it's free to play.
All in all it's pretty safe to state that both of them are the largest pillars of ESPORTS right now, so just get along and enjoy what you have.