I own both, I think they are both good. If I could only own one, I think I would choose my buggy. I like the look of the truck more, but the handling of the buggy better.

The difference is the appearance including the side trays, 19 vs. 20 tooth input gear in the transmission, and the engine if you compare to the RTR. The truck wheels have a little less offset and are narrower than the buggy wheels to keep the tires tucked in the fenders. A few other differences, but it is quite easy to change from a buggy to a truck or vice versa, cheaper to go from a truck to a buggy though. Also as mentioned bodies for the truck can be expensive.