Qiongqi, "Scripture of Mountains and Seas · Inner Northern Scripture" also has records, with the appearance of a tiger, having wings, adept at fighting, extremely ferocious, likes eating good people, and protecting evil ones.
Depending on each person's mana, and inherent abilities, the dragon and tiger cultivated will be different.
Rather than thinking about which kind of dragon, or which kind of tiger to cultivate into, one should consider more whether they are able to cultivate into one at all.
Extremely difficult, otherwise why would it be called Great Divine Power? The required mana is tremendous, with becoming an Immortal being merely the entry point, evidently it's a cultivation technique from before the interruption of the Dragon Vein.
In terms of combat capability, Li Changzhou had already entered the realm of Immortals, but it was uncertain whether he had the mana.