To deal with the talent shortage in their respective countries, many countries offer PR to foreign skilled professionals. PR gives you the status of a local and greatly improves the chances of you finding a job. Also, with a PR, you do not require employer sponsorship.
On the other hand, a work permit is for a limited time only and is contract-based as well.
While individual circumstances might differ from person to person, a PR status usually provides you better returns as compared to a work permit