So, with all of the new EWR-SFO flights that UA has added to compete with VX, I often have many different choices around the same time that are equally good for me. So I have started thinking, which seats are best? I'm generally booking an instant upgrade to business class. Occasionally, there is a 757-200 V4 Intl on this route; of course, those have the best business class seats and are the first choice. But of the remaining options, how do they compare? E.g., on a typical day I can fly 737-800, 757-200 (domestic), or A320. Which of these do people like best? Why?