I've no desire to even log on with my wizard. What's more fun these days? DH or monk?
I am a Monk main with an alt DH (mostly for Act 1 Bounty runs). Both are pretty fun. DH has more burst damage so if you are looking to clear early Torments quickly then DH is a good pick. Monk does more sustain damage but in groups he is really powerful as he has one of the best skills in the game.
DH is really weak though in terms of toughness and Monk requires speccing for OWE to be somewhat tankable. This is a result of the main stat giving dodge which is garbage.
As far as fun goes it depends on if you like to play in meler or play at range. Both are fun in their way. It's fun grouping mobs together with Cyclone Strike, tagging them with Exploding Palm and kick them until they blow up. It's also fun Vaulting around at top speed and one shotting mobs with Cluster Arrow as a DH and turning on Vengeance to become a walking turret.
I prefer Monk overall due to better survivability and his skillset is more fun. DH seems a bit binary again with everyone either using pets or Cluster Arrow build (hell even the pet DHs use Cluster Arrow)