I've read a bunch of these threads, but one thing that never seems to get mentioned is in-flight-entertainment. I'm tall (6'7") and my neck gets stiff watching movies on my table on my tray table. As such, I use the seat-back in front of me to hold my tablet, then the movies are at eye-level. To me, that's why I choose Row 2 over Row 1, since Row 1 doesn't have a seatback to hold my tablet.

-HD