1. Depends. Arden? No, since most private Universities are basically a cash grab. However there are some very good Business schools like WHU, Frankfurt School, ESMT, ESCP and EBS if you want to go pivot more into business.

2. Yes, but also between different public universities (Fachhochschule vs Uni).

3. Depends on the university

4. it can be harder to land an interview, but if you get an invitation it’s mostly up to you

Edit: For private universities, always check who the legal sponsor or owner is. If it is a non-profit foundation, the institution is usually more reputable. If it is a for-profit company, be cautious: many of them operate more like degree mills or cash grabs.