You can never compare styles after all they are different thats why its compare Muay Thai and Kung Fu not Kung Fu and Kung Fu.
But its about the person, the chances are that a experience Muay Thai fighter verses a Kung Fu starter that the Muay Thai guy is going to win and visa versa.
You can never compare styles its like apples and oranges.
but IMO the Shoalin Kung Fu monks are amazing and i have no doubt that a good one could beat alot of the pro MMA fighters.
Ive seen a video of some of them and they are lightning fast but afterall i do have limited knowledge on them.