Motor choice for a quadcopter, DC coreless or BLDC?
The main one in your list of specs : more RPM = less torque for the same power. So it'll spin a propellor faster but that propellor has to be tiny. 

Spinning a large prop slower produces more thrust (lifts a bigger quadcopter) for the same power.

And this isn't about BLDC vs brushed : it's just about sizing the prop and motor to the job you want it to do. Unless it's a tiny quadcopter the 50000rpm motor will be the wrong choice, however it is controlled.

Once you have the right size, speed and power of motor, you can choose BLDC or brushed in that size, speed, power. (I have even taken a brushed motor and made a BLDC out of it). 

And BLDC will always be slightly higher performance (as well as longer lasting). But if simplicity matters more than performance, you can probably make the brushed one fly.