It is organized into the strongest to the weakest:
1. White Tiger
3. Black Panther
I am not sure about the first two, since they are both guardian gods of the world. But if you strip their guardian gods title, I think Dragons>Turtles....?
1. Azure Dragon
2. Black Turtle
I am not sure which one is strong and which one is weak since there is way too many, so I'll just list it out. This is incomplete for the record, since the series is yet to be continued.