I had both, the Dude kicked the ZD to the curb, still have the Dude, in fact 2 of them now. Never tried the Barber, I went Fractal.
I used the Dude through a Supro Jupiter or something at a brief onstage jam with RF at his summer camp back in 2018 and it sounded great. BTW, RF was running the Dumble clean or just at the edge of getting hairy and kicked in the ZD for more gain-y stuff.
He also told us at the time that he had been reluctant to use the Dumble for touring, but apparently AD told him if any damage occurred he could bring it back to him and he would repair it, so he overcame his reluctance to tour with them. I guess that may have changed since AD passed away.