That hasn't been decided yet. Undertaker and Triple H haven't battled yet but I'm guessing that Undertaker won because he has a 18-0 Streak
Undertaker
No. Undertaker won the match.
The Undertaker beat Triple H at Wrestlemania 27 and 28
Undertaker. He defeated Triple H by submission.
The Undertaker defeated Triple H at WrestleMania 27.
The Undertaker's opponent at WrestleMania 27 was Triple H.
Undertaker by way of Submission
The UnderTaker did lose at WrestleMania.
The Undertaker (and Triple H) were legitimately fined by the WWE for violating the company's "Concussion policy" at the event.
No. Undertaker did.