What are the two primary types of scuba masks, and which one is considered the better choice?

Dive masks come in two primary styles, one being a three-pane, and the other a four-pane.  Both options work well but there are differences in design.  For the three-pane design, the front lens is made from a single piece of material, coupled with side windows on the left and right.  For the four-pane design, the front lens is made from two pieces of material and again, side windows are included.  Most divers prefer the three-pane design simply because it offers better front and peripheral vision.