After playing AA Duel Destinies, both have strong arguments. They both have an unshakable will to seek the truth. Apollo risked his own life to find the truth behind his murdered friend, Phoenix on his first case back had won the Non Guilty verdict for his client yet he did not want to settle for anything less than justice. He put his career on the line again when he had already won just for the sake of finding the absolute truth. I'd say Phoenix has the edge with his years of experience and more cool head. Apollo in time will be a more nonsense and ruthless lawyer in my opinion.
In a fist fight, again have to give the edge to Phoenix for acquiring old man strength.