I don't have this one:
http://www.classicjetsims.com/WorldTraffic/
but as far as I know it's the only commercial offer for generalized World Air Traffic for X-Plane 10.
I don't think it can compare to similar products for FSX, but I never used such programs there either ( well, just UT once, but was too heavy on my system... ).
X-Plane 10 needs it's World airports to be populated with buildings, parking slots, taxiway info, etc..., pretty much as MSFS has AFCADs...
