Difference between 2 Neu motors.

[Trick440]

What would be the difference between a ...

Neu 1512 2d/F (2600Kv) vs. Neu 1512 2.5d/f (2000Kv)

This would be in a Revo.

power feel?
Would the runtimes be much different?
etc...

I want the 1512 2.5d/f but its not in stock and am looking for another option. Trying to stay away from the 1515 series I heard they have more power consumption, and I would like a good balance or runtimes vs. power.