Statement:
The level of criminal activities is higher in Afghanistan than in Oman

In the The Most Criminal Countries rating Afghanistan holds position #3 ²⁰²² out of 139 and Oman is #133 out of 139 ²⁰²².
Position of Afghanistan is worse than position of Oman.
Afghanistan 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 Oman

Referencies:

1. The Most Criminal Countries ²⁰²² by Numbeo

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

   Afghanistan	'Crime Index' value is	78.19
   Oman	'Crime Index' value is	19.72