It is difficult to definitively say who would win between Sonic the Hedgehog and Mario as it ultimately depends on the context and parameters of their respective encounters. Both characters are beloved mascots of their respective companies, Sega and Nintendo, and possess unique abilities and skills. Sonic the Hedgehog is known for his incredible speed, agility, and ability to curl into a ball to attack enemies. He can also collect rings for protection and has a strong sense of justice. Mario, on the other hand, is a well-rounded character with abilities such as jumping, stomping on enemies, and utilizing power-ups like the Super Mushroom and Fire Flower to gain additional abilities. If it is a footrace, Sonic would most likely win due to his unmatched speed. However, if it is a battle taking place in a platform-style game, Mario's versatility and access to a variety of power-ups could give him an advantage. Ultimately, the winner would depend on the specific circumstances and the objectives of the encounter.