I think S8 has a regular version (not the “edge”). My son has an S7 (same screen) that he tossed onto a sofa cushion from two feet away and the screen cracked and broke, eventually after two weeks the screen went completely black.
He had a rubber case on the phone as well as a Zagg (type) screen protector.
The rest of us (4) in the family all have S5’s with the same phone protection installed; I know I’ve dropped my phone on the cement garage floor and nothing happened to it.
I’m the one that sets up the phones, when I played around with my son’s S7 I wasn’t impressed with it being any better then the S5; only difference is that we can’t install/use Samsung Pay on the S5, and the charging pad would be nice.
I did a search and found an article written by a guy with an S8 that kept trying various screen protectors, his favorite one was by OTAO. I ordered one for my son for $8 from ebay (hasn’t arrived yet because it was from overseas).