AF2 is a clear winner for me, the others are just unusable. With X-Plane I have to turn down the settings to minimum and it looks like I'm flying over a lifeless, dull world whilst suffering from cataracts. P3D is better, but the movement is delayed and makes me feel not great.
With AF2, I can run on max settings and it's super smooth throughout. To care rid of the carpet orthos effect, I have to fly quite high up or in an area covered by autogen, but taxiing around KEGE or LOWI for example is really amazing. I'm really happy AF2 is shortly getting a helicopter.