MSFS advantages: -- visuals (though X-Plane 9 closed this gap a fair amount) -- licensed scenery content (scenery library) -- large developer/add-on communit

MSFS advantages: -- visuals (though X-Plane 9 closed this gap a fair amount) -- licensed scenery content (scenery library) -- large developer/add-on community (Level3, etc) X-Plane advantages: -- Flight Model (geometry based, not lookuptable based) -- Mutli-Platform (Win/Mac/Linux) -- Networked operation out of box (vs 3rd party payware FSUIPC) -- Developer relations (all major devs maintain blogs, etc) -- Scenery/aircraft development tools (open-source AC3D plugin, WED, DSFMaker)