My uncle is an ex. Cathay pilot who retired 2 years ago from 777s after flying the 747-400, 300, 200 and the Tristar / 707. Naturally, his favorite was the 777 but he said that the 747-400 was far superior to the -300s which he disliked but also the -200. He says the -400 is far more reliable and operates better than the others.
I tend to agree. The -400 is very reliable and I always feel comfortable when flying aboard one. I sometimes get a little nervous flying aboard older planes because I know that they are getting old even though newer doesn't always mean better. SO for me, 744 rocks