Statement:
The level of criminal activities is higher in South Africa than in Brunei

In the The Most Criminal Countries rating South Africa holds position #4 ²⁰²² out of 139 and Brunei is #111 out of 139 ²⁰²².
Position of South Africa is worse than position of Brunei.
South Africa 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 Brunei

Referencies:

1. The Most Criminal Countries ²⁰²² by Numbeo

   The countries in the rating sorted by 'Crime Index' in descending order.

   Brunei	'Crime Index' value is	29.55
   South Africa	'Crime Index' value is	75.37