The 3M mask definitely had a tight seal. I looked at the Breathe Healthy masks and they appear to have gathering at the sides to give it a better fit, still none of them appeared as if they would work for me. I am guessing your masks were not used for a study
Unscientifically, when I look at people in general wearing cloth, surgical, or N95 masks, those wearing an N95 mask appear to have a better seal around their faces. As you said, there are always exceptions.