Any role can be considered easiest to learn but hardest to master imo. Really depends on the player.
I consider ADC / APC (mages) the hardest because the delay that the auto attack takes to travel (for last hitting) drives me nuts.
Top's the easiest to me because you tend to face less damage-stacked players (so, bruisers or tanks) so there's less damage going out at a given pace and last hitting is easy to me (since all I play is melee). I know a few people that do not like top at all.
I consider ADC / APC (mages) the hardest because the delay that the auto attack takes to travel (for last hitting) drives me nuts.
Top's the easiest to me because you tend to face less damage-stacked players (so, bruisers or tanks) so there's less damage going out at a given pace and last hitting is easy to me (since all I play is melee). I know a few people that do not like top at all.