what's more system graphics friendly?

Apples to oranges. XP has a whole lot less detail than FSX, both in resolution and objects, so naturally, it will be easier oin the frames.

I feel the main reason there is increased interest in XP now is that many can see where it might be headed and hoping to have an impact/input on that future to be the sim that FSX isn't to them, or just plain curiosity

Try this comparison which I found very fair
http://www.flightsimulatorguide.com/xp-vs-msfs.html
 
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