The last time I went on a mask hunt I looked for 3 years and tried on hundreds of masks to find one that fit. My face shape apparently is not real common, so masks that fit me with the beard and 'stach are also uncommon. I bought 3 of them, and had custom ground lenses put in two. I did two dives with them (one each) and went back and bought another 9 masks. The 9 went into inert gas storage. That was about 12 years ago and I'm down to two masks again. The advantage was that the masks that actually fit were $15 each after a bit of negotiation, while the two sets of lenses were about $400 total. $s is not the big factor in choosing a mask, fit and displacement is.
I have had this problem several times in the last 30 years, and found that mask manufacturers tend to change models enough so the lenses won't fit every couple or three years. This is annoying if the lenses are still good, but the skirt starts to fray and you just need a new body to be back in business. I've gotten to the point that I don't trust a manufacturer to keep a model on the shelf for more than a few months. If it works, get several.
My primary considerations are fit and lens distance from the eye. I prefer the bonded in plano lenses for vision correction over the ground in versions because the "puddle" in the concave inside of a ground in lens is _always_ precisely where I want to look when things get critical. The small "annular" between the lens and mask body provides a place for the puddle to go that is not involved in vision.
First try LOTS of masks on. Do this in the water if possible, but dry on the sales floor is better than not at all. If you can pop the mask in place and walk around the store less the strap and without constantly inhaling you have a candidate for further testing.
I have a frameless mask on the way to test dive. I hope it works out all right. I'm only a year into the search for a new mask though.
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