Upon first glance if you had to choose one solely based on visual durability the o ring chain fits the bill.
What does an o ring chain look like.
The x ring chain is a specialized type of sealed roller chain used to transfer mechanical power.
The o rings actually somewhat self lubricating rubber inserts that fit in between the outside link plates and inside roller link plates seal in lubrication and seal out.
Chain manufacturers began to include this feature in 1971 after the application was invented by joseph montano while working for whitney chain of hartford connecticut.
The x ring type chains are more modern chains with x shaped rubber ring placed in between the chain plates to seal the grease filled inside the chain components.
The o ring chain is named for the rubber o rings built into the space between the outside link plate and the inside roller link plates.
The o ring chain looks beefier and feels quite a bit heavier too.
You can use either the o ring chain or not o ring chain for our bike is around 65 at my local shop you need to change your sprockets as well as the chain they must ware together or the chain will ware out much quicker.
It has higher performance in terms of durability lifetime and power loss than non o ring chains as it has less friction than o ring chain while.
It uses x ring seal to keep lubricant usually grease in place.
Like the standard o ring chains it is also used in high performance motorcycles.
As upon pressing these type of rings come in contact with lesser surface area and hence less drag coefficient is generated with same efficient sealing property as o ring chains provide.
These fittings are filled with a manufacturer installed lubricating grease that forms a protective barrier over the entire chain.