That's a bloody cruel poll, but it's a cruel world! Aloes arm wrestle agaves for first place, but Pachypodiums are bulking up in the gym, for me at least, to murder a metaphor. Aloes win through sheer variety of form and heroic persistence in the face of my dufus cultivational blunders.
A good tree aloe takes a lot of beating. My barberae is the only succy I have that's bigger than I am, and that's a great feeling.
But then my pachypodium baronii flowered for five months this year!
It must be about to die