Comparing XPlane and MSFS I have come to the following conclusions.
MSFS has absolutely stunning graphics and Fly by wire A320 is nice , flightbeam NZAA and NZWN are top rate.
But... Frustration with airliners trying to follow flightpaths coded int the FMC. Approaches tend to go to custard especially Heathrow.
X plane has mediocre graphics but you get where you are going with little fuss. Not as pretty but avionics are great. Autogen can help scenery at higher flight levels though.