Better masks are obviously better.

> completely ineffective when wet,

As far as I know this is not correct. I remember to have read a study showing quite well that even a wet cloth mask(1) still contains the spread of aerosols surprisingly well. Sure it's far worse then a medical mask of any kinda but still a surprisingly high improvement compared to the no-mask scenario.

> which they get after 15 minutes or so of breathing through them.

In my personal experience this is far from correct, through this depends on the definition of "wet" and the weather.

(1): As long as they are not made of a specific kind of material, which e.g. is often used for bicycle masks and sometimes for scarfs which might from the get to go make thinks worse by splitting the aerosols into smaller lighter ones without stopping them at all.