Gameplay wise, I really enjoy the Warlock. Misty Step + Repelling Blast can be great fun. That said, my primary experience with the class in game is by bringing Wyll along. The interaction he has with his patron seems far more interesting than seemingly nonexistent patron interaction Tav has.
Character wise, I am enjoying Wizard the most. I remade one of my TT characters, a mostly good aligned Tiefling scholar who is unwise and overconfident when it comes to decision making. (These tadpole powers seem useful! We could gain better understanding of our situation if we try!) I do wish they implemented a few more wizard schools. I am doing Evocation right now, which is solid, but I would like one that focused more on control spells.