New Edition, of course!
Oh, what edition of D&D? Sorry for the confusion.
My favorite edition of D&D is....
CASTLES & CRUSADES!
I've written about my love for C&C before, as well as how "it's all D&D to me." I don't care what you call the game you're playing. If it has the D&D "DNA" (i.e. based on D&D mechanics), then you are playing D&D. And C&C is my preferred version of AD&D, these days. It does what I need it to do, period. And it's the spiritual successor to AD&D. If you've never checked it out, do yourself a favor and take a look!