Also the warranty. Don't go for supplier warranties.

Make sure it is local manufacturer warranty. If you go for a supplier warranty, be prepared to be without a phone for months while they take their time fixing your device.

Its just the toughness of the glass. The higher gorrila glass is more resistant to scratches than the older iterations. In most cases, scratches aren't the biggest worry cause you're gonna plaster a screen protector over it anyway.

The more important point is that it is also more shatter resistant but no glass in the world can save a clumsy person.