I currently run both
Gideon Jura and
Elspeth, Sun's Champion. If I had to do it over again and could only take one, I really like Gideon "Get Some" Jura, and I think he is probably the most interesting option. I do like how dramatic the E-Dawg is, for sure, but this kind of boils down to a "dramatic" vs "most interesting" question to me, and I'm inclined to favour the interesting card in all matters. I don't think they're too far apart on power level because G-Daddy can really be a beast with little work, but obviously Elly's brood is pretty pushed making 3 chumperoonies and her -ability can be a real GG effect, board depending.
Knight-Errant scares me a lot and as much as I love that alt duel deck art I dunno that I'll ever actually cave and run her. If I did, it would only be as a replacement for
Citadel Siege, which may even be better than Knightspeth.