I got the 3M 8210, it's general multipurpose, for dusty working environment etc. The 1870 is more geared towards TB exposure, designed to be used in health care setting according to 3M's website. But as long as it's NIOSH approved as a Type N95, it's probably all that matters. I wonder when I will have to actually use it. Most of the time it's for when you are sick and have to prevent spreading the disease. Another use I find is for extreme cold weather, the kind when you go outside and your nostril hair freezes instantly. I've read some use those respirators for this purpose but I'm rather considering a Seirus neoprene face mask for this purpose.