I'm completely unfamiliar with these two sims, are they quite similar to MSFS2020 in every aspect? Do they have season change? The only reason I want to leave FS20 is that there's only summer scenery. I still see lush and green in Maine, totally unrealistic....
P3D is similar to FSX, but more advanced.
X-Plane is totally different, go to YouTube and look at some of the videos.