In a fight, the cheetah's speed would be its main advantage. It would try to outrun the boar and tire it out. The boar, on the other hand, would try to use its tusks to gore the cheetah and inflict serious injuries.
The outcome of a fight between a cheetah and a wild boar would depend on a number of factors, including the size and strength of the individual animals and the terrain on which they are fighting. However, in general, the cheetah would have the advantage due to its speed and agility.