re: Better Heel & Face: HBK or HHH?
HBK was the better face. Truth be told neither was amazing as a face - but HBK had his run with the title in the 90s as a top face and he did well enough. He also did well as a face later in his career - even though it was a top of card face, not necessarily a champion.
In contrast - even when HHH is a face he's kind of a dick lol. I think some of his DX stuff (after HBK left) was as a face and he did good - but it's blurred lines between face/heel.
For heel - I personally absolutely loved HBK's initial DX run as a heel. It's some of my favorite moments ever in wrestling history, so I want to give him the nod for this here.
HHH is probably objectively better - he's had more success, and in terms of being a true heel who garners proper heat and is a legitimate top wrestler - he's had way more success. I do prefer HBK heel though, so i'll give him the nod.