Oh boy! People at AA are almost "into blows" when these two cartridges are compared.
FWIW, I have the 103R on a Teres table and OL arm. My brother has the AT on a Teres table and OL illustrious arm.
Both sounds perfectly wonderful. On my 103R, I found that loading it at 100 Ohms is the best. On his AT, my brother is loading it at around 250 Ohms and the cart is performing brilliantly.
So, I would say that either one you come up with, you will be happy. Both are great carts IMHO.
FWIW, I have the 103R on a Teres table and OL arm. My brother has the AT on a Teres table and OL illustrious arm.
Both sounds perfectly wonderful. On my 103R, I found that loading it at 100 Ohms is the best. On his AT, my brother is loading it at around 250 Ohms and the cart is performing brilliantly.
So, I would say that either one you come up with, you will be happy. Both are great carts IMHO.