Statement:
The level of criminal activities is lower in Sudan than in Nigeria

In the The Most Criminal Countries rating Sudan holds position #75 2022 out of 139 and Nigeria is #17 out of 139 2022.
Position of Sudan is better than position of Nigeria.
Nigeria is leader of the "The Most Criminal Countries" rating. So it is wise to avoid visiting the country or, at least, you need to take additional actions to protect your life and belongings, compared to Sudan

Referencies:

  1. The Most Criminal Countries 2022 by Numbeo
    The countries in the rating sorted by 'Crime Index' in descending order.
    Nigeria 'Crime Index' value is 64.09
    Sudan 'Crime Index' value is 45.59