1. Don't restrict yourself to two options.

2. Don't chase perceived prestige. In a few years nobody will care

3. I don't know, but I'm assuming you're young. If you already have a BSc or similar and have been accepted by Cambridge then there are many places you could go. The people you meet and get to know could unlock future flexibility.

4. Don't work for Amazon. Maybe they made you a good offer but, even more so than other corporations, they don't care about you. They'll run you hot and then stick a fork in you without a moment's hesitation.