Same thing I said for the favorite neck bucker thread:
My choice would very much depend on the guitar!
For vintage output pickups I like the Pearly Gates, Antiquity, Seth Lover and 59B. For hotter output pickups I like the JB and Custom Custom. And I would make my final choice only after some experimentation and trial and error.
Generally though, alnico 5 pickups sound particularly good in guitars like Gibson SG's...thin bodied guitars with long necks that lack deep bass and whose natural resonance accentuates the twangy mids and treble. Alnico 5 buckers tend to have more bass and are a real plus in guitars that lack bass.
Alnico 2 pickups seem to have more mids and a little less bass and often a little less treble. They're particualarly good when you want warm up a bright guitar...or add some mids to a guitar.
But it really depends on the resonance of the guitar and personal taste.
Lew