I would get xt as I don’t trust hollowpin chains
Only the 10speed chain is hollowpin, and after years of running other hollowpin chains, I don’t see what is not to trust.
The nickel coating on the XTR chain makes a big difference to the durability of the chain. It is very resistant to surface rust (if you leave it wet overnight etc). I recently shortened an XTR chain I’d used for a few months, and took the chance to look at the wear between the inner and outer plates; the nickel coating was still intact.
Plus, Rose Bikes do them for £17 posted. http://www.rosebikes.co.uk/article/shimano-chain-9-speed-dura-ace-cn-7701/aid:38115