I am planning a trans Pacific trip and obviously hope to be able to use e-Upgrades. But in the event I can't upgrade, what is the best Preferred seat in economy on a 777? I've never flown in Y on a 777 and hope I won't have to start. But I will be booking T+ so upgrade is only possible 7 days out and as an SE I can book a Preferred seat at no cost. So which is the best seat to select? Advice gratefully accepted.