Who's got the more legendary feud with Undertaker: Mankind or Shawn Michaels?

Mankind, there feud was legendary, there matches were 5 stars, and had many amazing moments, that michaels vs taker matches just lacked, besides the 3 tomb stones. They also had way more matches then that, and mankind set the bar for ever HIAC match. Also Undertaker didn't break kayfabe, they had respect for each other.