For me it's about what you want to try and "bring out" in the smoke.
Youngs double choc stout and sam smith oatmeal stout bring out some of the dark but sweet flavors
Magic hat #9 has a very disticnt twang about it and when paired with a stick helps point out some contrast, I find that the #9 has a mild fruity finish and love it with the medium body smokes.
for subtle notes or earthy tones I love the scotch! Pick up some Oban Peat for a heavy earth tone.
My go to though is probably Guiness.mmmmmmmm