Fs9 more then suits me.
I have FSuX with all the mods. Doesn’t do it for me at all.
Only reason I’d try FSX version 2 - or P3Dud as it’s called I think - is to use Just Flights 747 Classic assuming it actually is any good.
X-Pain - tried it and it was awesome. Not. (I had to put that because if you write how terrible it really is, your posts get deleted. I thought that was only happening at JimYoungsAvsim and his merry men and his PMDG or nothing else domain. Guess not).
Maybe if FS12 runs ok, and has decent add-ons worth flying - Classic 747, 727 etc, I may switch. Otherwise, no.