I only Use now KN95 mask because compared to N95 of US standard it is too expensive while kn95 is 300% lower in price.
I bought KN95 as I've heard it's a good mask but after receiving the actual mask, I've seen that there's an allowance in the middle of it.
I went back to surgical mask, it's also cheap and I've bought a box I guess around $4 for 50 pcs. I can't remember.
actually there are many designs of kn95 and there are also many fake designs.
this is why many People are still using surgical mask as it was more safer and cheaper.
I only use some surgical as long as with tissue inside.