At Animal Kingdom I take the time to walk through the two trails but I would say that Gorilla Falls is my favorite. The reason for this is gorillas and the meerkats.
This trip I was able to see the Hippo up close as they made their way through the water, kind of walking on the bottom-very cool!!
Also, the baby gorilla slid headfirst down a slanted rock area and definitely looked like he had done this before:)