If it's helpful, I would also consider IAH, which pre-Covid was flown on a 772. You get Polaris seating with center pairs if that's what you and/or your partner prefer, a longer TATL flight and thus shorter flight in domestic F, and an easier international-to-domestic connection experience than ORD or EWR. At ORD you definitely need to switch terminals using a landside train (assuming the train modernization project is finally complete by April 2022), and at EWR there is a chance you would need to make a similar switch (the customs area at terminal C is currently closed due to reduced traffic, and even when it is open some UA international flights arrive at terminal B due to gate constraints).