I've had several of each type, I choose equipment for the way it sounds and absolutely would not allow the type of volume control to limit my choices.
My Aesthetix Callisto was dual volume control and I used and enjoyed it for about ten years. Never gave a thought one way or the other that two knobs were turned up and down.
Now I have a preamp that has traditional (single) volume control and I have the best sound I've ever had but not because of the volume control.
A dual volume control should (in theory) be better, the two channels are more discrete and provide better signal to noise and separation at the critical point of controlling output voltage.
My Aesthetix Callisto was dual volume control and I used and enjoyed it for about ten years. Never gave a thought one way or the other that two knobs were turned up and down.
Now I have a preamp that has traditional (single) volume control and I have the best sound I've ever had but not because of the volume control.
A dual volume control should (in theory) be better, the two channels are more discrete and provide better signal to noise and separation at the critical point of controlling output voltage.