Go NH all the way. I took my first flight on this route on UA...eh...the last three I have taken on NH and its so nice. its a 1-2-1 config in business class with a lot of privacy for every passenger and great service. easy to sleep on the lie flat bed
ua is 2-4-2 which is terrible for a biz class product.
now once they offer the 787 on this route I might change my mind