I thought it might ease in my mask clearing. However, after a few dives with it, I purchased a new one that has a lower profile, and without the purge valves. I personally do not see the difference in the ease in clearing these masks. It s just a matter of personal choice. Equalising You d have to be able to pinch your nose and equalise with the mask on.
Some masks have skirtings shaped in such a way that are very difficult for divers to equalise.
Profiles Low profile Low profile masks are those with lesser air volume that is enclosed by the mask and your face. It is lighter, easier to equalise, purge, and has less drag. Very much more comfortable. They usually come in two lenses, instead of a single one. However, lower profile would mean less peripheral vision, and higher chances of it fogging.