A person much wiser than myself once told me, "It's the cook, not the cooker". Just sayin'.
Typically when referrring to the finished product / meat, correct? I believe the references here are about the effeciency of the UDS v the Pro Q.
Having owned and competed with both, in my experience the UDS is much more "set and forget" than the ProQ. I've said it here before, I loved the "stackability" of the ProQ but it did not hold temp as well as my drums and it burned far more fuel. Could it be the cook? Absolutely.
Your mileage of course may vary...