New mud Vs. Z?

Groups → Mudbox

Yep, that thread again, but this time on the hub.

If you HAD to only use one, which would it be? I see lots of artists using both, but there are artists I admire a lot who seem to only use one or the other (like antropus or Aaron Sims for Zbrush and Kolby Jukes or Mashru Mishu for Mudbox).

I like both, but if I had to pick only one it would be Zbrush because I feel like the only areas where the new Mud wins clearly is in visual fidelity and UI clarity. I can live with less visual fidelity and even a clunky (but customizable) UI if that means an increase in speed (I think ZB is just a little faster) and extra tools (Zspheres, transpose, subtools).

What do you think?