Most underdisplay fingerprint scanners are between mediocre to garbage. Optical scanners are slightly better but considered less secure, ultrasonic ones are a flaming PoS. Both on Samsung S-line, A-line and several Chinese Oneplus phones I've used personally, for years at a time.
Usually they require a very specific state of the fingers, not too clean (don't work after washing and drying hands usually) and not too dirty, not too damaged, not too oily etc. Winter zero degree weather causing invisible condensation or wetness on a screen? Nope. Rain or drizzle? Nada. Also Samsung specifically on their S-line has some obvious software glitches I've confirmed on my phone. For example - in normal conditions, inside apartment, with reasonably clean hands, try to unlock and fail 5 times in a row, input password, then immediately lock the phone and try scanner once again and it will work realiably. It seems that having phone initially in "sleep/hibernation" causes its scaner brains to freeze and glitch, and only fully operational OS causes it to start working properly.
I can totally see why Apple would opt for a better user experience, even if it's not as hyped or flashy on a shop display.
Usually they require a very specific state of the fingers, not too clean (don't work after washing and drying hands usually) and not too dirty, not too damaged, not too oily etc. Winter zero degree weather causing invisible condensation or wetness on a screen? Nope. Rain or drizzle? Nada. Also Samsung specifically on their S-line has some obvious software glitches I've confirmed on my phone. For example - in normal conditions, inside apartment, with reasonably clean hands, try to unlock and fail 5 times in a row, input password, then immediately lock the phone and try scanner once again and it will work realiably. It seems that having phone initially in "sleep/hibernation" causes its scaner brains to freeze and glitch, and only fully operational OS causes it to start working properly.
I can totally see why Apple would opt for a better user experience, even if it's not as hyped or flashy on a shop display.