Druid. My other two are fun, but Druid has it all:
- Instant flight form, even when falling or running
- Gather or click most things in flight form
- 30% speed increase indoors with three more speed boosts
- Aquatic form so I can live underwater forever
- Broad hit AoE
- I can tank, mdps, rdps, or heal
- So many cool mogs
- Class Hall mount can carry a passenger
- Class Hall fit is fire
- Tons of Lore and special interactions in certain dungeons
- Ability to solo 95% of the game