As one of those chaps who has made models for both simulators, I can tell you it is not easy to model the same behaviour in both sims.

That said, use both and master them on the PC before heading to the field. It will help a lot. Make sure you turn the wind on with gusts in both sims to help in learning how to recover from wind gusts.

If you take the same airplane and let two modelers set it up, you will have different flying characteristics. There are too many variables not to have differences. Where the battery rests controls the center of gravity (CG). Which hole you put the push rod in on the servo and control horn also effect the control throws. A different choice in battery or charger can effect performance. Even simple changes in your pre-flight routine can change how a model flys.

So don't sweat the extreme accuracy of the sim, just fly them and any others that are close to your model to get a general feel for how the airplanes behave. The simulator version is only one model, not all that your specific model can be.

Happy flying!

ggunners