BodyGuardz HD Contours are the only screen protector that I've been totally happy with for my edge phones because of the fit and durability. All glass protectors I've tried have been a miss with the edge phones because they don't fit well and the adhesive is usually just the top and bottom, allowing dust to get in. BodyGuardz also is case friendly as well.
If the screen was flat, then I would look for a glass protector. For my S8+, I will get a BodyGuardz like I did with my S7e. I will never buy a glass screen protector from Otterbein, by the way.
I did also buy the Spigen neo flex protectors as backup because i dont know if BodyGuardz will be available or in stock before I get the phone, and I need to put something on the screen before using it! The problem I have with the Spigen ones is that when I had them for my Note7, the healing properties didn't work well and my stylus left grooves and marks on the screen even with light use. But they're cheap and good enough to hold me over until I get a BodyGuardz.