You can play as a good/resisting Durge, and in terms of your actions it’s not that much different from a good Tav. Except for like two or three involuntary things. Otherwise, you always have a choice. Even with the involuntary things, you do often have a choice over how it plays out. (For example, you may have heard that the Durge kicks a squirrel to kill it. Well, if you talk to the squirrel with the “speak with animals” skill activated, that doesn’t happen at all. So still, choice.) And I love it, I think it adds so much to the game for the player character to have an investment in unraveling the plot just as much as the companions do. I highly recommend it, even if it’s just once.
