The Traxxas T-Maxx is probably the best choice for giving to a kid. They are super tough. Traxxas became the king of backyard bashing monster truck RC's. Parts and upgrades are easily available.
After that they are all about the same. Losi, Tamiya, Axial, Team Associated are all great names in the industry. If you are after realism, Tamiya makes the most realistic bodies and wheels.
For kids a 2wd Monster Truck might be the most fun. Not all kids are down with the Crawlers since they don't go that fast and jump over stuff. The Monster Truck format is the most forgiving to drive and crash. Trophy Trucks, Truggies, and Buggies take more skill and are easier to break. On road cars are an explosion waiting to happen.
This one's Nitro, but Electric is the best choice for kids and nowadays with LiPo and Brushless motors, electric can be much more powerful.