Lucky 7! What edition do you prefer?
Easy! 4th edition is the best!
The old Games Workshop green cover with the great painting of Elric atop ruins as he destroys the Young Kingdoms. You have some rules clarifications from preceding editions (demon summonings & skills), and it adds in the material from the Companion.
Oh. We're not talking about Stormbringer? D&D? Oh, then definitely NOT 4th edition.
I played 4e once. ONCE. Two hours to build a character. Made me want to cry.
I've read 3e, seems needlessly complicated. The Midnight campaign setting I'd easily poach, though. Damn good. Easily portable to Basic Roleplaying, hell there's even a BRP retroclone called 'Age of Shadow' that tacitly does this.
I played a whack of 2e games back in the day. Lots of fun, and tons of great settings. Planescape is basically the Multiverse. Spelljammer and Dark Sun were nicely gonzo and deserve retro-clones. Mazatlan and Al-Qadim were interesting experiments. You could also play a whole campaign out of the Vikings, Celts, or Rome splatbooks. I dunno why they didn't do one for every major culture's mythos. Even Lankhmar got some adventures & sourcebooks.
Never played 1e - by the time I was gaming in earnest, people had moved on to the cleaner 2e rules.
I started with D&D, but I'll be damned if I know which book. Most probably a mishmash of BX and BECMI.
I'm dying to try Swords & Wizardry Whitebox, maybe with Age of Conan. Peanut butter and chocolate.
I'd have to say my favorite edition is whatever I'm playing at the moment. The differences before 3e seem really inconsequential to me. My recent Labyrinth Lord experiences with Vaults of Ur felt the same as all that came before, and markedly different from the 4e I suffered through. And I'd have to chuck in some houserules (mainly skills) anyway, so it's all good.
8 - Favorite Character You Have Played
Funnily enough, all D&D characters I have played were ill-defined, probably because 'world-building' was never a big thing back in the day. The gameworld in the late 80s and 90s was more like that endless loop of scenery in the background when Scooby and Shaggy were hightailing it from some suited goon - just a means to get to the dungeon. I noticed how things had changed when I played in Vaults of Ur last year - Justin's gameworld was incredibly vivid and detailed. It takes a bit more player investment and GM work, but I think it is a great development in the art of gaming.
Enough digressions - my favorite fantasy character I ever played was Emile (Eh-meel), deposed King of Wallachia and Bard.
I consider that a thing to be proud of.