I'm using Gorilla glass 2, with only a screen protector... I haven't dropped my phone before... But here's my opinion anyway. I think if you are clumsy and often drop your phone, no tempered glass can save it if it lands on the "perfect spot" which causes the screen to crack. For example, my friend who had tempered glass on his Galaxy s4 dropped his phone and the tempered glass was not damaged. However, the screen underneath the tempered glass cracked and had to be replaced. If you treat your phone well, no tempered glass is really required for protection and Gorilla glass is good enough for protection. However, screen protectors are still advised to prevent scratches so it can extend the screen life.
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