Hu is good at calculating with eight characters, while Zuo Qingshan is good at calculating with Daoism. If you want to choose, you have to choose according to your personal needs, because the eight characters are more suitable for calculating long-term fortune changes and life trends; Daoist magic, on the other hand, is good at finding specific changes. He doesn't need a birthday.
So each has his own strengths, and he didn't say which is better. He just decides who will be better according to what he wants to test.