Nice poll - go 3E!
I gotta go with 3E. My main reason is the smooth core mechanic (d20). Roll a d20, beat this number. Simple. Saves the complexity for plots and adventure design. The faster new players can learn the hobby, the better. Get on with the game itself!
1E had its good points, but other than for nostalgic reasons, it can't compete with 3E. IMO.
2E had many, many, many "OPTIONAL" supplements. Some of which were good, some bad, and some in between, but I think there were too many. Between those and the various (needed, IMO) house rules I don't think any two groups played the same version of 2E in the end. Not to mention it was chock full of rules inconsistencies. That was very bad and 3E needed to come out when it did.
I'm not sure what OD&D is. If its pre-1E, then I've never played it or read any of the books. If it's the Mystara "demihuman-races-are-classes" D&D I have about the same thoughts about it as 1E.
As a side note, I just bought the Hackmaster PHB and GMG. Love them! Not sure when I'll get to play it, but they have tons of good tables and whatnot useable for any FRPG. Go KenzerCo (tm)! (No, I don't work for them)