None of them are comfortable over a period of time. The snug fitting
masks are hot, and build up a lot of moisture in the mask even on cold
days.

I would buy a mask from a vendor which would allow me to return the
unit should it be unsatisfactory, namely HD or Lowes.

They have a nice 3M mask there, as well as an AO safety. For me the
3M edges out the AO mask as it fits my head better. YMMV.

MAKE SURE you buy a mask that has filters that you can easily
replace. I have bought masks that you have to order filters online to
replace, and it is a pain. The 3M masks have the correct charcoal
filter replacements at our local HD as well as the Sherwin Williams
stores.

Remember that you will need to replace the filters on the mask every
90 days after opening the sealed package. Do not be concerned about
how much you did or didn't use the mask. The activated charcoal no
longer works effectively after that time. When that happens, you
might as well be wearing a dust mask.

Replace the prefilters (prefilters are highly recommended) as needed.
If I am spraying inside a house in a tented room, I can usually get a
kitchen and the baths out of a prefilter on a house. If I am spraying
in open air, they seem to last forever.

Lastly, regardless of the make, the mask should be easy to clean
inside. Sweat, dirt, a running nose, dirt, etc., all make the inside
of your mask about as sanitary as your armpit. It should be easy to
clean and keep clean.

Robert