Speed (v. good), class 2 strength (good enough with his speed), healing factor, durability. Skill suggested to be superior to that of Wolverine.
Mandarin has a great striking power, but he lacks the showings against skilled opponents. Pre-Extremis Tony w/o armor actually got some licks in 😂
Either could win depending on writer's mood of course, they're both elite fighters, but I'm leaning towards Gorgon.