Xring isn't the best you can buy.
Chain pitch hasto do with its physical size, ours are 520x98 factory unless you have a first gen.
Tensle strength is extremely important. Go not run anything weaker then 10000 lbs because you can break it with just the motor pulling. Experience here.
All that being said, the best chain and sprockets to buy are sidewinder ti2 and smartchain2 those are the best but cost about 430$ to get a full set. They will never wear out.
However a smart chain is about 120-160$ and thats what I will be running shortly, and gen1pat is already running.