In all of China's traditional theater plays, which is the best to sing, better mastered

I am a student of theater theory, politely speaking, which cadence, singing is difficult to master, and even more unlikely to have any attainments in a short period of time.

Hard to say which is easy to catch, but also consider which place you are from and so on. It's complicated.

If you have a standardized Mandarin and are from the north, try Peking Opera, it's very catchy. Kunqu these southern plays are more soft and gentle, more suitable for southerners, and Huangmei Opera these are southern plays.

Speaking superficially, I can only help you so much. I'm not sure if I'm going to be able to do that.