Lets not only think about strenth lets think about experience.Mario has [bundle of sticks]hten turtles mushrooms with fangs and a Giant snapping turtle dragon thing.Sonic has faught robot versions of every weapon and animal in the world.In the way of powering up,Sonic can turn golden and float and distroy anything that gets in his way,Mario gets bigger and mabey metal. All and all I think the great meta Knight from the Kirby series would win.