Ekaton, the RNAS is my primary WWI focus, as well, both regarding flight sims and modelling.
After getting both WOFF and RoF, I got very little time to spend with either one, the last couple of months. That should change soon, and I will get more training/flying time in.
My preference is WOFF, but the Felixstowe and the missions for it is what keeps RoF on my computer.
Hopefully WOFF will include such, in the not too distant future, and I'll retire RoF when it does