I am not using the mobile version of AF2 anymore as my ipads are pretty old and so have low performance and my new tablet is a surface go and so is on windows 10 rather than ios or android.
I have done some instrument flying on the mobile app but found only one approach that could be done due to not being able to adjust VOR radial.
I also have a desktop with an 8700k at 5GHz and a GTX1080 that I use for VR so would be looking at the desktop version. Shame IPACS don't do a demo so I can compare to xplane.
If you buy AFS2 on Steam you can use it for max 2 hours (within 2 weeks) and if you don't like it you can ask for a refund, no questions asked. There's your demo. Steam's refund option is awesome: I've used it numerous times and it never failed me.