NZFF

Have found a few variations between Plan-G & AIP NZ airfield data.
ie runway length, elevation & bearing.
I am assuming the AIP figures would be the more accurate.

AIP would be smack on the nose, all those little troublesome ups and downs, this ways and that are your FS limitations.

If you are flying in the real world, I would use AIP. If you are flying in the sim, I would use PlanG, which has probably built it's data from in game. Let's not forget FSX has been out a long time now. It's as much a time machine as it is a simulator.