Wattage
Under 250W
250W to 400W
400W to 500W
500W to 600W
600W to 800W
800W to 1,000W
1000W to 1200W
Amperage
Under 4 mAh
4 mAh to 6 mAh
6 mAh to 8 mAh
8 mAh to 10 mAh
10 mAh to 12mAh
12 mAh to 15 mAh
15 mAh to 18 mAh
18 mAh to 20 mAh
1200W to 1500W
When the skateboard is moving fast, the load is not putting as much force on the motor the faster the load on the board is moving. Peak power is good when you want to accelerate fast and have enough torque to get you moving. Many boards require you to kick off or the board doesn't have enough torque to move you up a hill, for example, from a stopped position.

A brushed motor has more bottom end torque. The E-glide board uses brushed motors while most of the boards are super efficient and use brushless motors.

When going up a hill the motor is working at a much different RPM than it does when it goes on flats or down hill. More of the constant power is used, and less amps are also used.

The motors that let a 200 pound person accelerate to 22 mph in 5 seconds and another board that takes 10 seconds to get to 22mph will have a lower constannt power than the other board.

If someone wants more constant power and less peak power, the brushed boards are usually preferred. A the speed increases with brushed motors, the torque drops. The people that want the power at the first part of the acceleration usually choose brushed motors. The people that want less torque and don't need the G force in the beginning of the acceleration usually choose the brushless motors. Each have their own pros and cons. If someone is heavy and starts and stops frequently, then definitely the brushed. For people riding in the city, going 20 miles, then definately brushless.
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ELECTRIC SKATEBOARD CONSUMER GUIDE