I like the B744 configuration the best (3-4-3)!
Going to NRT from LAX on SIA I got stuck with the window seat! I don't think I ever gone 10 hours with going to the bathroom once! It got a little cramped after hour 6.
My return trip (TPE to LAX (we went from NRT to TPE)), me and my dad shared the middle row! Yep, we both got 2 seats! No being cramped here! A little taste of first class in economy! You could push back the armrest and lay down. The one complaint was that the very next day they would start a new round of movies (We traveled Dec. 31)! I had to watch the same ones that I saw on my NRT-LAX flight.
Well, just something interesting, I got home with 3 seconds left in the year!