N95 Mask Recommendations

I recently had to begin masking again following a primary immunodeficiency diagnosis, on top of having several autoimmune diseases. I have been looking at several different types of KN95 and N95 masks that would allow me to return to work (I'm a teacher/behaviour interventionist, with no mask mandates still in effect in my school district) and be able to attend some higher risk indoor events. However, I'm completely overwhelmed by the number of options and am afraid of spending money on counterfeits! What are you folks using? Any suggestions would be much appreciated! <3