RC cars do not have to be fast to be fun. Offroader are designed for difficult terrain and adverse conditions also offering driving pleasure.
Buggies are actually a mix of on-road and off-road cars and are therefore good for people who have difficulties deciding. They are agile and relatively fast on smooth roads. They can also handle terrain, but are very slow due to the low wheelbase.
Anyone looking for an action vehicle for jumping is better advised with a monster truck. Due to the enormous ground clearance and the oversized tires, rough terrain is no problem for it.
The Truggy is a combination of buggy and monster truck and a real all-rounder: It has the maneuverability of the buggy, but is also suitable for jumps and runs easily on various terrain. It can be controlled on smooth roads as well as through mud or off-road.
Crawlers, also known as scalers, are a unique challenge even though they go really slow. As the name implies, a crawler is designed to climb on rocks as well as on steep hills. It's about slow, controlled and precise speed to overcome challenging obstacles and barriers.