I don't like most of them, but I enjoy Dimension 20 for the creative homebrew settings and funny group dynamics as well as the editing.
I also will occasionally watch an episode of a different actual play if it uses a system I'd like to try out, for instance I was thinking about running Beam Saber for some friends, so I found a one-shot actual play where the GM was the creator of the game. That gave me a strong idea of the intended style of the system and tone of the setting.