Preferably druid cuz they can do anything.
they cant cast wish, fireball or lightning bolt!
Right, those are all Wizard/Sorcerer spells. Druids can cast Call Lightning, Elemental Swarm, and Flame Strike. While in the shape of a grizzly bear.
Call Lighting does 3d6 per shot with, I believe, the same range as a Lightning Bolt and the caster can use 1 bolt per caster level per round to a maximum of 10, which would be 30d6 over ten rounds compared to the 10d6 in a single shot from an equal level wizard (who is not in grizzly bear form at the time).
That's not the point, of course, since this thread is only about what people's favorite classes are and neither druid or wizard is one of my favorites.
I personally like the simplicity of the 9th Level Martial Maneuver: Strike of Perfect Clarity, which allows the user to make one standard attack and if they hit adds 100 points of bonus damage. If you are playing a Warblade than you can do it every other round too.
Or the 5th level strike which adds 6d6 and automatically overcomes any Hardness or Damage Reduction on the target. I used that one to open doors.
I love Martial Adepts.