For most liked I'm torn between Slayer, Agility and Thieving. I seem to like skills that keep you busy lol. I'd have to say slayer, as slow as xp can be it's fun and get's many other levels along with it from the actual fighting to herbs, etc from drops. For least Farming, slow and waiting around. I'm paying farmer people to look after my trees for just 30 and getting xp from ToG (alternating with Con).