Mutiple Rotating Frame VS Sliding Mesh Method
 

I am an undergraduate in mechanical engineering and novice in Ansys and C.F.D.I am willing to find transient solution of a fan blade rotating in a room until i obtain a “statistically steady-state”.
I have got confused between M.R.F and Sliding Mesh Method.Which one would be more appropriate as given the case of my problem?
Any kind of help could be very helpful for me.