I felt like Kane as a character was way more compelling. Undertaker was just an undertaker.(i know oversimplifying). It's closer than yall are leading on.(I'm going to say Undertaker in his prime). Kane being unmasked is a classic moment. And, IMO, Kane's character always had a roof on it because Taker had to be protected. Yall think Taker could make a tag team with Xpac and D-Bry work? Kane wasn't no bum. Kane may not have been a full time main-eventer but he was one hell of an enhancement talent that could easily be put into the main event scene at any moment. I mean shyt, Kane's there full fukking time in 2016 helping shyt.
But I will say Undertaker, because he's had alot of epic moments. And he really was a phenom and his entrance became a spectacle itself.
But, "better" can defined in many ways.