Statement:
The level of criminal activities is lower in Tanzania than in Papua New Guinea

In the The Most Criminal Countries rating Tanzania holds position #36 ²⁰²² out of 139 and Papua New Guinea is #2 out of 139 ²⁰²².
Position of Tanzania is better than position of Papua New Guinea.
Papua New Guinea 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 Tanzania

Referencies:

1. The Most Criminal Countries ²⁰²² by Numbeo

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

   Papua New Guinea	'Crime Index' value is	80.26
   Tanzania	'Crime Index' value is	55.79