For Radar EV the differences in fit of AF vs reg fit are:
AF stems sit a bit looser in the head. Regular fit sit tighter together to the sides of the head.
The nose bomb is thicker in AF but that is easily swapped.
Lens shape is a tad different.
So then really, if I try the AF its not going to be that helpful. Since my head is traditional oval western shape rather than round Aisian shape.