I think it's probably hard to rank them but being CFO also requires specific hard skills that you can't improvise on A good COO will also have specific experie

I think it's probably hard to rank them but being CFO also requires specific hard skills that you can't improvise on A good COO will also have specific experience and therefore hard skills and easily outclass a general manager that's just winging it... but some operations are simpler than others, so the requirements associated with any of these C-level roles (including CFO and GC) are really on a spectrum