For what it is worth now, there a number of mask comparative analyses out there now (eg wirecutter) which measured the filtration and give recommendations on wh

For what it is worth now, there a number of mask comparative analyses out there now (eg wirecutter) which measured the filtration and give recommendations on which masks are both easy to breathe through and good at filtering. It is not always the ones that are hardest to breathe through (though the counterfactual is generally true: being harder to breathe through generally corresponds to higher filtration)