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
Short and long boards have different turning radiuses.
Longer boards ride smoother but have larger turning radiuses. The average radius range is from 7 meters to 10 meters.
If using the board in a big city its good to have a smaller turning radius to turns can be sharp. But this can be dangerous if its too sharp. There are different factors that determine the turning radius of the board, which are the height of the deck. Some electric skateboards are really high and some are super low to the ground. Some motors are on the tail above the board to keep it lower and the belts above the board also. Wheel size also plays a factor as well as the shape they are in. The way the truck is designed also is a factor as well as the wheel base.

If you want a short or longer turning radius, please let me know on my skateboard quiz. 
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ELECTRIC SKATEBOARD CONSUMER GUIDE