3E as it is still the edition which has the most options for gameplay besides dungeon hack&slash thanks to its skill system. Also, I like Combat as War more than Combat as Sport.
5E sounds like it turned D&D around into the, in my eyes, right direction again, but because of the very "simplyfied" rules stays behind 3E.
4E... Lets not mention it.
2E does sound interesting too from the things I read, bit I never played, so no idea.