Upgrade advice 763 or 764?
I'm flying IAD-GVA on PMUA 767-300 and GVA-EWR on a PMCO 767-400ER, having just spent most of my miles on reward travel for my entire family this Christmas (hopefully the world doesn't end on 12/21), I only have enough miles left to upgrade (+copay) on either the outbound or the inbound, which one should I go for?