KF94's are also equally effective (and similar in comfort to KN95's.) There are concerns about counterfeits of KN95's in general and masks made in China in general though so KR95's (Korean) made in Korea or n95s made not in China are more reliable options.

Even a counterfeit mask claiming to be any of the above is likely to be alrightish and far better than nothing.

What you want to look for generally is a triple-layer (or more) mask that is made from non-woven/melt-blown material that gets a good seal. Beyond that just finding something you can afford, reliably get and feel comfortable wearing are kind of the next most important things to look for (the mask you wear is always better than the one you don't!)