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Hello Amkum,

The Transient Rotor-Stator model takes into account all of the transient flow characteristics. This model is robust and yields high accuracy predictions of loading. The drawbacks include high computational cost and large amounts of storage required to hold the transient data.

I would recommend you to use the Transient blade row interaction. For the type of transient blade row interaction. Please go through the link in which depending on pitch ratio one among the three - profile, time or fourier transformation methods have been used.

11.6.3. Selecting an Appropriate Transient Blade Row Model with Pitch Change (ansys.com)

I hope now you will get a clear picture to use which method. 

Thanks,