I don't like the half-windsor and the other triangular necktie knots. They're just too regular for me. Instead, give me a slightly asymmetrical four in hand every day. The too-fashionable example in the photo from Robert Talbott is hardly irregular but it's the shape I like. Big enough to fill a cutaway collar but not too big for a tab.
Emulating the late Duke of Windsor, I have my neckties made a bit thicker than normal, so I get a knot about the same size as a half windsor. Or I'll loop the wide end of a ready-made necktie an extra time around the knot to make it a bit larger and shorten the ends at the same time. Either way, the tie hangs just slightly askew, and that degagé air is, in my opinion, the way it should be.