Which is better for a 10-year-old?

The Billy Goat KD. It is built for ages 8–13, has a 24.5-inch seat and caps at 19 MPH. The Dirt Goat is an adult off-road machine and is not suitable for a child.

The Dirt Goat has heavier-duty suspension, brakes and a bigger battery, so its components are built for harder use. The KD is a light kids' bike with simpler parts and a smaller pack.

Is the Dirt Goat worth stepping up to?

Only if you are an adult riding off-road on private land. It adds real power, suspension and brakes, but it is not a family bike and cannot replace the KD for a child.

Can the Dirt Goat be ridden on the street?

No. With a 65 MPH top speed and dirt-bike geometry it is an off-road machine. The KD is closer to a legal e-bike for paths and neighborhood rides.

Which is easier to store and transport?

The KD at 39 lbs fits in a garage or on a rack. The Dirt Goat is a full-size dirt bike that needs a ramp or a trailer.

Goat Power Bikes Billy Goat KD vs Dirt Goat 96V V3

These are not rivals. The Billy Goat KD is a 39 lb kids' e-bike for riders 8–13 up to 150 lbs, capped at 19 MPH in Power Mode. The Dirt Goat 96V V3 is a full-size electric dirt bike with a 6,000W mid-drive, 65 MPH top speed and a 32-inch seat. Buy the KD for a child learning to ride electric; buy the Dirt Goat only for an experienced adult on private land.

Choose the Billy Goat KD if you are buying for a rider aged 8–13 who needs a light, low, speed-limited first e-bike.
Choose the Dirt Goat 96V V3 if you are an adult rider with off-road experience and private land to ride it on.

Prices

Goat Power Bikes Billy Goat KD: $799.00 at Goat Power Bikes (last seen Nov 13)
Dirt Goat 96V V3: $6,999.00 at Goat Power Bikes (checked today)
Difference: the Goat Power Bikes Billy Goat KD is $6,200.00 cheaper than the Dirt Goat 96V V3 at the latest prices (Nov 13 and Nov 14)