I prefer playing support, but since I barely play the game anymore I can't really play anything else than mid AP carry. Favourite supports being soraka and janna and favourite AP being annie.
...yeah they're the easiest to play...
If I was to come back to the game, I would obviously play everything, but I think my favourite is support, I think before I stopped playing I was also playing solo top, mainly garen, and tank, mainly shen.
I hate playing AD carry, I have played it a bit but I just hate it.