If you had the opportunity to train with the founder of your Art (assuming time travel was possible in many cases), or a current big name instructor in your Art, who would you choose & why? Don't forget to mention what Art it is in which you train.
Chojun Miyagi, but with my luck he would say no. But anyway that would be my choice.
Definitely my own sensei. Miyagi Sensei did not permit questions during his instruction and he rarely demonstrated any of his own kata. I imagine it would have been very frustrating being his student despite his lofty status as the founder of the Goju tradition.