Aside from the liquid screen protectors, pretty much all screen protectors are made by the same few factories in China - very little difference in quality. The only differences are really the finish - matte, gloss, semi gloss, etc.
Gorilla glass is more scratch/impact resistant than your standard Iphone glass screens, but it's still glass and resistant doesn't mean indestructible.
Some people hate having that extra bit of plastic on their screen and feel it degrades the touch performance and/or image quality, but that's all subjective. Google for drop tests of your specific phone if you're unsure.
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