It's not necessarily better to master a more powerful Law, but rather to master the Law most suitable for oneself. If you comprehend only one-tenth of a powerful Law, you might be outdone by someone who fully comprehends a regular Law.
Moreover, the stronger the Law, the harder it is to comprehend. Take Song Quan's Law of Light for example—powerful, yes, but Song Quan, from the era of the Main God to the present, has experienced countless passing years and has only mastered perhaps less than one-tenth of it. He's certainly weak, but actually, Song Quan is aware that this Law may not be well-suited for him. Yet, he lacks the courage to abandon the Law of Light and start anew.
