Considering the McQuality that Boeing is turning these days, I'm not sure it matters.

To the OP:

United converted 25 orders for the A350-900 to -1000's, plus another 10 aircraft in June of 2013. The first of the 35 deliveries is currently published to start in 2018.

The EASA granted 370 minutes ETOPS last week, FAA reviews flight test data next (787 has 330 minute ETOPS for comparison). The 350 flight tests have been virtually flawless and production is ramping up MUCH faster than the 787. The -1000 which will compete with the 777X will almost certainly beat the Boeing product to market.