My two cents.
Difficult to tell. For an instructor rating I would think, that the flying part is not that important. Theory and teaching experience would be more important. A comparision of the subjects a new CFI has to learn would probably be more interesting, than just comparing the fligth hours required.
How much ADM and risk management is covered, or teaching methods and so on. A good instructor must be a good teacher, not necessarily the best pilot. But he should know how to save the day for everybody.
