Nitro cars are faster but who need that? You need a lot of space to use them, a lot of skill not to wreck them and the engine can go far more wrong than an electric motor.
Battery powered road cars are also limited. They need fairly flat, smooth ground to run on where as an off road truck can do most of the things a road car can do, plus batter over the dirt and grass as well.
If you buy a novice a nitro road car it will get used once and either smashed or left on a shelf to look pretty. I'd go for a two-wheel drive Tamiya off road truck. Yeah, two-wheel drive otherwise you have too much grip and can't do spins, doughnuts etc. Tamiya because parts are really easy to get, because you will need them! ;0) We've got three Tamiya trucks and a Genesis one.