They both had incredibly braindead cartoons and writing. But if I were to say which one is better, I would say Hanna-Barbara, just because they had some good cartoons from the 1960s and the mid-to-late 90s. Most of their cartoons from the 70s and 80s are incredibly horrible to watch as an adult. As for Filmation, I can't name one cartoon from that company that still stands the test of time for me as an adult. The only reason why these cartoons were good in the first place was because you grew up with them.