There is no definitive answer to what the best car in Hill Climb Racing is, as different vehicles perform better on different stages. However, some vehicles are generally considered to be good all-around choices, such as the Moonlander, Super Offroad, Dragster, Dune Buggy, and Rally Car. The Super Offroad is also considered a jack-of-all-trades vehicle that excels in speed, acceleration, handling, and durability. The race car is another popular choice that works well in many levels once fully upgraded. Ultimately, the best vehicle to use depends on personal preference and the specific stage being played.