I voted for Mouthpiece, but liked them both LoL. I just liked his design and character voice. Especially the second one
Pain and Terror by far was my overall favorite, simply because they made the whole Carnivora atmosphere a fantastic part of the game. Listening to them along the way was just plain fun. And my favorite line: “Vault Hunter we are a professional organization. You need intro music. PICK ONE!!!” or something like that.
Pretty Boy and Freddy are up there but I can only pick three so went with Pretty Boy.
I will always love Handsome Jack, even though he personally is no longer around.