I decided to try both in a way. I will do the ANA economy flight NRT to ORD. Then on the way back I will do the 787 from DEN to NRT in United economy plus.

Sucks that the seat map for ANA said all seats were unavailable so when I called they said only middle seats were left -_- . Oh well. Hopefully at check in a better seat will open up.

Thanks for all the replies. They were much appreciated!