I think you just have to ask yourself - do you want to sit 5 hours at a 20-30 degree recline (domestic F seats) or at a 150 degree recline (3 class 763 seats)?
------------------
When once you have experienced being a 1K, you will forever fly the friendly skies with your eyes set on 100% mileage bonus and SWUs, for there you have been, and there you will always long to return, every year!