Statement:
The level of criminal activities is lower in Japan than in China

In the The Most Criminal Countries rating Japan holds position #129 2022 out of 139 and China is #112 out of 139 2022.
Position of Japan is better than position of China.
Japan is an outsider of the "The Most Criminal Countries" rating. So in most cases, you can feel safe and unlikely will face a criminal, compared to China

Referencies:

  1. The Most Criminal Countries 2022 by Numbeo
    The countries in the rating sorted by 'Crime Index' in descending order.
    China 'Crime Index' value is 28.82
    Japan 'Crime Index' value is 22.24