X flight 11 has a free demo, and FlyInside turns it into a full functioning VR game (With Leap Motion support) https://flyinside-fsx.com/ (Also has a free demo)
Well, the old baggage is what make the game great. If I had to rebuy all the add-on to XP, first I can't get it, second it would set me back around $3000 USD.
Prepar3d will soon upgrade and go to 64bit, many of the addons will ofc be obsolete, but not all. I still stick to prepar3D as you can only get some of the very detailed plane models, like The MJC8 Q400 pro addon including flight model and physics to FSX/Prepar3D.
The weather model addons are mostly also only for Prepar3D.