I'll tell you what I've found.
I have fairly coarse facial hair.
My favourite grind is the 1/4 hollow. It works a treat on my face.
Recently I purchased a T.I full hollow, my first full hollow as I thought they couldn't handle my type of hair.
The first shave I had with , I was blown away. Although the thinness of the tang made it tricky to keep a grasp of.
The second shave was also good. The third was a fail , I had a weeks worth of growth and I did get through it but not to my satisfaction.
I think a full hollow wont hold up as long as a 1/4 wedge can, on a coarse beard.
I've also got a near wedge custom but I think its more for looking at than actually shaving with
Personally 1/4 wedge 6/8ths are the best for my facial hair....