I know questions like this are quickly closed according to your rules but this question is not about which one is better.
I have criteria as a Ubuntu user who wants to take a RedHat certification. My office wants me to take it. As I guess files would be arranged in a particular ways in the Debian family, I wanted to use a Desktop OS which is closed to RedHat instead. I am looking at stability, ease of use (I will be developing as well, mostly Java and maven stuff), the one which would not shutdown because of overheating and ideally one with nice package manager like Ubuntu's own.