The screen protector distort colors and text. The quality of the screen with a screen protector is horrible.
I have never used a screen protector since my first iphone 1 and because I take care of the iphone I have never scratched the screen.
If you want to avoid scratches you have to follow some simple rules:
1- Never place your iphone with keys, coins, or any other object in your pockets.
2- Never place your iphone anywhere with the screen facing down.
3- Never wear rings
4- Never give your iphone to friends or ladies that use earrings. Or if they have to use your iphone they can use the speakerphone.
The iphone screen is very durable and it will only scratch with very few things.
The screen won't scratch easily. The oleophobic coating scratches from a paper towel.