You need to be very cautious about comparing online postings of brand X motor is 65A and Brand Y motor is 85A. I see many postings that do not indicate the RPM that the readings were taken. This is the most important aspect of being able to cross compare power systems as it provides an indication of the output of the motor.

Obviously a motor turning 500 RPM more on the same prop would have higher amps, but without that information the reader interprets this as the higher amps being less efficient which may not be the case at all.

From what I have read and learned is that when you compare the best inrunners to the best outrunners in bench and controlled testing is that they are only about 5% different, with the inrunner being more efficient.

In the real world this is not really noticeable, as flying style has so much more to do with used capacity than efficiency.