Ozu is the best, he had the most remarkable sensitivity. If anybody's familiar with the Japanese aesthetic of Mono No Aware, you'll understand how Ozu can tell sad stories with so much dignity. Even Mizoguchi, as great as he is, admired Ozu. He once said something to the effect of, "I make the impossible seem possible, Ozu makes the possible seem like it really is possible", which I naturally assume relates to the family dynamic. All three are worth watching for their different views of humanism, and Naruse should be added to the list, although I know prints are hard to come by, I've watched several Ozu, Mizoguchi, and Naruse films in Japanese, simply because that's the only way I can see them.