The handguards of the EFD are bigger, so it is easier to flip the blade open.
the handle design of the EFD allows an easy change between fistgrip and reverse grip.
I hope this helps...
I own an EFD and can vouche for this. The grooves on the EFD make it easy to reverse grip. Also, if one would use the EFD as a non-lethal impact weapon, these groves would provide good grip for this application.
I used to fence foil and these guards allow one to hold the dagger in the fencing grip. If one holds it in the fist grip the grooves match up with where one's fingers would go and coupled with the anodized aluminum grip this offers very good grip.
I have not handled the AFD, but there are advantages to getting the EFD with 440C steel besides the price savings. 440C is easier to sharpen and Boker has a solid history of working with 440C.
More than just Dietmar Pohl worked on the EFD, unlike the AFD. Metzner, Friedrich, and Newman worked with Pohl to design and improve the AFD, making the EFD. Frank B. Metzner und Joachim Friedrich are recognized close combat trainers for the German police and run a large fighting school. Newman. Prof. Bill Newman has been studying asian and european martial arts since the 60's and is a recognized expert of the phillipino art escrima. Escrima is derived from the Spanish word "esgrima", which means "fencing."
Other differences on the EFD are that it has a wider hollow grind, giving an unprecedented sharp edge to a dagger, and the opening for the thumb stud in the handle was changed to make it easier to open the dagger using the thumb stud.
I really like the Boker 2200 EFD Escrima Folding Dagger.
I hope this helped.