As someone with sensitive skin, I’ve always went toward mild razors to prevent irritation. They tend to work well for me but I have some spots that get irritated because I have to go at it from multiple angles to get the hair. I also think I have coarse hair which makes it a little more uncomfortable. I used my Fatboy on the fourth setting which is more than I usually do but it has taken out my most difficult spots with ease. I can feel the blade more but my skin seems to handle it well and not break out. So efficient may be better than mild. Aggressive tears me up.