My kid has an X-Plane rig and there's a lot of cool plugins, aircraft, and addons available right now to use. I don't know if or what the 3rd party market for FSX20 will be or when it will be available so it's all a matter of your timeframe.

If you're lazy or won't use anything more powerful than a phone, you might as well play with toy simulators and/or Infinite Flight.

https://infiniteflight.com/