Dragoon or Monk

[ExiaQuanta]

IMO. both do pretty high dps and can be comparable sometimes. Dragoons can burst dps but monk has sustain DPS imo. MNK is probably a bit harder to play in some situations but its more "rewarding". MNK has more of a "casual" and light armor to them while dragoon gear is probably looks like a skinnier version of tank gear.

With the way the game is, I suggest you just Level all three melees up there and adapt to what your static(if you have one or gonna be in one) wants. Sometimes its good to have Dragon kick if there is to much raid wide Magic dmg going out. if there is no brd or no need for Dragon Kick, run as NIN as Vulnerability can benefit the raid DPS. Or if you see that its beneficial to go DRG cause you have a BRD/MCH than run as that. Otherwise it can simply just so you can go like
"Meh today i feel like playing NIN/MNK/DRG today". All three do pretty high DPS and are pretty fun in their own way. each bring their own utility to the group.