Wish the oGCDs were less clunky in FFXIV. Mashing the button until it actually goes off because of the animation delays is meh.

WoW's combat feels more fluid in some ways. Hit button do damage.

Some abilities in XIV like Butcher's Block or Rage of Halone you have to wait a couple seconds for the damage to register since the animation has multiple hits especially when you are trying to snap aggro it's annoying because you know you have hate, but it will still go by, and as soon as the damage goes off it turns around.

Damage shields like Sacred Soil don't proc unless the server tick goes off even if you are under them. Especially a problem with Garuda's Spiny shield and Collective Unconscious since the AST is immobile while using it. Sometimes you get lucky and the server tick goes off right away other times you have to wait another 2 sec.