It’s surprisingly tricky to discern the balance of classes. Ostensibly you could compare two classes but the role of classes vary, allowing them to do very different things. Balance in this regard is often a value judgement over what features are stronger. Comparing classes favours what the judger considers more important, making it something of a Rorschach test.

PvP doesn’t work very well as a determine factor  since classes are meant to work together, so classes that are meant to synergize and not compete.