Curiously, in the recent purchase by Microsoft of the ZeniMax game studios (and all the various game studios that ZeniMax owns) they issued a statement to the effect that no longer would games be released incomplete to be "fixed" in update patches flowing out rapidly after release. Funny how they would make that statement, given how they've managed to do essentially that with MSFS2020 -- although the frequency of the update patches leaves a lot to be desired.
However, for my flying situation (practically all of it VFR, short flights in single-engine planes) MSFS2020 works just fine with a few start-up failures putting me back on the desktop. And I've always got FS9 with all of the addons I purchased to fall back on if MSFS2020 fails me. FS-X never worked well for me, no matter what sort of hardware I have used, so I never really enjoyed that. But FS9 is solid as a rock, frame rates close to 100fps with graphic sliders on full.