Fit is very important. As I think is the amount of light it lets in.AnZal:Don't have problems mask-clearing, and do see your point for not needing extra gadgets and more complications. The mask in question, a Tusa model (Imprex Hyperdry) also fits well, and it would probably be that which will be the deciding factor.
Purge or non purge? I never use my hands for clearing my ears, and it can be nice to have both those free to hang onto stuff, like cameras, downlines, and divers.
Once the purge mask is on, I do not have to touch it to clear out any water, from say an introductory diver bashing into me.
I like the Imprex Hyperdry.
Aloha Turtleguy