I've said it before.....
... and I'll say it again.
The 7E7 will be a better aircraft than the A350. On certain routes.
The A350 will be a better aircraft than the 7E7. On certain routes.
Which an airline chooses will depend on its needs for its route network. An order for the 7E7 should be celebrated, not because it is "one in the eye" for Airbus, but because it is a good product that hopefully will make its owners loads of money and be rewarding to operate for the crews, and popular with the punters. The same is true the other way around!
The bottom line is this - saying "A350 vs 7E7" is only remotely a sensible question if you tell us what load, what timetable, what route etc etc.
Then we can come to a sensible decision - as the potential customers will.
TA