Fit is the most important thing, it trumps everything else.
Most advanced divers prefer low volume: it is easer to equalize, clear, and is less bulky.
A purge valve is one more thing that can go wrong, clearing your mask is not a big deal.
IMHO, skirt color (black, clear, or tinted) is a matter of personal preference, as are side windows, x-vision type design, tinted lenses, and all the other options.
I highly recommend a slap strap, they are unbreakable.
__________________ I am not the one who needs mental help. I just need to vent. |