Aisle, because I need the room for my long legs.
1B: the catbird set, right by the lavatory and near the cockpit (so I can see what's going on in the galley and the cockpit.
But if AuH20 or Mr. Lion are on the plane I guess I can give it up for you.
ANother of the cat's rules: if there is someone (esp a nice lady) who wants to sit by the window, I would switch. (remember Drew Barrymore in "The Wedding Singer?")