I’ve always been a big fan of the WWF undisputed championship that they had for a bit after unifying the WWF and WCW belts. It combines the best elements of the WWF Winged Eagle and the WCW Big Gold and makes something that just oozes class.
As for which ones get under my skin… honestly, the current WWE Championship design. It’s just the laziest design possible with a bunch of gemstones thrown on it.