A few key differences versus the H1B (correct me if I’m wrong - my understanding of H1B features are basis discussions I have seen here):
1. Not tied to a specific employer. At least theoretically this is the case though your residence permit clearly specifies your employer.
2. Family-friendly options where your family can join you with the initial visa application. Spouses/Partners are immediately eligible to work.
3. Integration courses for language and culture, offered for free usually, and for the entire family.
4. After 2 years, you can switch jobs and after an another year, you can apply for permanent residence. The steps and guidelines are clearly specified and all the laws side with the employer to ensure no exploitation or harassment.
1 - https://www.auswaertiges-amt.de/en/aamt/zugastimaa/buergerse...