This is kind of difficult for me to say, because I really really loved TT and HB, but I liked HH best because it wasn't at all self-referential. But that's kind of weird because I really did love seeing the brothers from each other's POV in TT, and the in-jokes in HB, yet when I compare them, the reason I liked HH best is the lack of that! And that's even discounting half-nekkid Sammy!

But I really liked that all of the jokes/pranks in HH were aimed at each other, not at the audience.

*shrug*