Alright so I currently own the PMDG 737NGX and for FPS I have it locked around 20. It tends to sit more around 14-18 FPS though on the ground. I get no stutters though and it appears as though the flying is very fluid and nice. I was wondering if it would be the same, worse, or better with the Airbus X Extended add-on, which I am considering.

 

~Thanks

On my system, the PMDG 737 NGX and the Aerosoft X Extended are almost identical in terms of FPS and performance now.

 

When first released the AXE had issues with the HTML logging and performance was awful.   But not, at 1.04 it's much much better and for me, almost identical to the NGX.

I agree with the above. They both run smoothly and about the same on my system - with the usual common sense caveats.