Rumor even had it that Samsung wanted to go that way with the Galaxy S8

Finally, an exciting new development could see the fingerprint sensor being placed underneath the display itself, which should take care of a few of the issues listed above at the same time. Rumor even had it that Samsung wanted to go that way with the Galaxy S8, but the technology wasn’t ready in time and the company had to make a last minute change and go with a rear-mounted sensor (that should also explain its off-center positioning.

To answer your other question - there’s no clear favorite position among our team. Yours truly would go with a rear-mounted sensor anytime, but many of Apple iPhone 6 Review
my colleagues swear by the frontal location. The Sony side position also has a few fans, so it’s a pretty even split.

Anonymous: Can you please explain the differences between screen types used in smartphones? Many users always ask about it and we Xiaomi Redmi 3S VS Xiaomi Redmi 3X do not have a clear understanding of TN, TFT, IPS, LCD, LED, OLED, AMOLED & Super AMOLED.

 

There are also confusing combination like IPS LCD, IPS-Neo, TFT LCD and so on. Sometimes I thought it is a typo on your behalf when reading the phone specs though I might be the ignorant one here.