In economy I prefer the 777 as often they are in a 2-5-2 configuration which allows a single traveler like me to sit by the window and not have to crawl over 2 people to pee. Plus if you are traveling with someone then you can sit in a pair alone. In addition, I really like the interior and LOT has a point that most airlines have put PTV's in all seats.
As far as Business and First class go, I prefer the 747. The arrangement of seats with most airlines is 2-3-2 on both aircraft. So sisnce the 747 is wider you'll get more space. Plus I have had one opportunity to fly on the upper deck of a 744 and Loved it, spacious, 2-2, and private! For first class nothing beats flying in the nose of a 747 with the abundance of space (on most airlines).
However, overall I love the two just the same