Assuming everything else is the same (car, weight, battery, gearing, ect) what is the advantage of a lower kv motor over a higher kv motor? Is it just that a lower kv motor has longer run times?or is there more to it? I know that the kv rating is directly related to rpm. so i know how that works but I am wondering if the torque is the same assuming all other factors are equal.

I have a rc18t with a 4120kv tacon motor. I have ordered a new tacon motor that is 7800kv. will the new 7800kv motor have the same amount of torque as the 4120kv motor? or will the 4120kv have more torque than the 7800kv? from what I understand the 4120kv will give me longer run times and of course the 7800kv will give me higher rpm. is the runtime the only trade off? or am I going to be loosing torque as well by going to a higher kv motor? will the truck perform the same at slower speeds with the 7800kv motor as it did when running the 4120kv motor?

Thanks