The top quality stuff.
I've used a lot of screen protectors the local one's, the tempered glass, the UV glass and even the same type of protectors from Ringke (basis of their brand name it's the worst quality as after applying that protector had an automatic tear when it was in pocket and the pocket only has my phone nothing else), whereas comes the GS(Gadget Shieldz) they're the best the quality is top notch my device is curved it doesn't usually have to many tempered options whereas although GS seems very thin film the strength it has is excellent. The only thing you'll have to keep in mind would be regarding application, one you apply it correctly it is going to stay there for a while.