plus another thing is that a lower kv motor can generally handle more voltage. If you have a 5700k or higher motor, usually running a 3S lipo or higher is too much for it.
Most companies list the kv ratings of their brushless motors, and some list the # of turns as well. Essentially the # to look at when comparing motors is the kv rating.
Brushless motors generally as a rule have less turns than a comparable brushed motor. But the principle stays the same, lower turns = higher rpm on both.
Hope this helps!
