OEM chain is very good. There are better aftermarket ones.
Just to make it clear there are two types of chains based on the sealing O ring and X ring based. X ring are better sealing.
Also there are many types based on chain strenght.
And there are two types of chains available based on the rivet link pins:
Soft-head pin rivet link that can be riveted easily and hard-head pin rivet link ones that require better tool and skills.
I have called DID tech support to check what kind is their pin rivet for particular chains - they had no idea?
Tsubaki tech support on the other hand has explained to me which of their chains is soft-head pin and which one is hard-head pin.
I bought Tsubaki Alpha X ring Gold chain.
Make of that what you want