This is a tough one. You have a choice between good and good. My only concern, which you seem to have addressed, is the notion that Dr. Fagin seems to have a kind of "factory" going, where surgeries are done one after another in a short period of time. You'd want to feel comfortable that Dr. Fagin and Dr. Su would both take the time to pay very close attention to your specific disease situation and anatomy once inside your body
If you feel comfortable with the individual attention you'll recieve, and you have some good second, third opinions on each surgeon's effectiveness for this surgery, then it probably doesn't matter which one you choose. Again a choice between "good" and "good." You are in control
I wish you the best in your decision and treatment!