I have both, and after using the Aerosoft version for a while, I'm now back on AoNs version of ENGM, the sole reason being the FPS hit on my system. In the Aerosoft configurator I put the trees on sparse, airport vehicles to off, but let 3D lights on(didn't try it off since this was the thing I liked the most). I really liked Aerosoft version mainly due to the lighting(no more floating lights), the little things such as that Gate approach sign(don't know what its officially called) that AoN doesnt have, runway/taxiway markings/signs.
The AoN version is not as detailed as Aerofts version, but because of the no FPS impact and that it is "good enough" I'm sticking to AoN for now.
Would really like to know if Stavanger X and Værnes X is equally hard on the system as I'm considering buying those as well...
CM HAF932 || i7 6700K@4,6Ghz w/Noctua NH-D14 || MSI Z170a Gaming Pro Carbon || Corsair 16GB@3000Mhz
MSI GeForce GTX 1070 Gaming X || Samsung 128gb 830 SSD || Samsung 512gb 850 SSD || Seagate 2TB SSHD || Corsair HX750W
X55 Rhino || G27 || TrackIR 5