I've been lucky enough to fly on 3 engine varients:-
767-300 - RR
767-300 - PW
767-300 - GE
US 767-200 - GE
I never used to like the 767,however I have come to like the plane,and in particular the seating,2-3-2.
I used to like using UA
777's,but have come to dislike the 2-5-2 or other airlines 3-3-3 layouts.
When travelling widebody longhaul i'd prefer any of the following over a 777 or 747:-