Thats one thing up to your decide factor when choosing screen protector for ur phone...

if you're a careful person who basically never drop your phone and fussy with hairline scratches and smoothness... i would say sapphire is a go, cause my sisters' xs max is using first gen sapphire and 6 months later the coating still good as new... given the fact from my experience ladies phone the screen protector oleophobic coating usually wear off faster reason from throwing their phone in the bag, make up stick on the phone, and sometimes accidental scratches from their earring... my sister has all these 3 happening to the sapphire but it still is good as new

sapphire = impossible to scratch but breaks easier
corning = harder to break but easier to scratch

afterall glass is still glass, it will break if there are forces impacted on it or drop... the only reason we use it is to protect our precious phone screen 

hope this info helps 



here is a strength test for the sapphire screen protector