Apple's iPhone 8 may be off to a good start from a sales perspective, however, it hasn't been a completely smooth launch. Reports off swelling iPhone 8 batteries have now surfaced on seven separate occasions.
https://www.notebookcheck.net/Not-so-swell-More-reports-of-iPhone-8-battery-swelling-issues.257808.0.html
It's a new feature 3D Depth Curved screen. Samsung's curved screen is just gimmick without any proper usage. This one, though, can affect your depth perception