sonic is also invincible in supersonic form, however I stated these both are not allowed because they're cheap ways to win. I believe sonic would win, since he is faster than Mario and his fire shield would make the fire flower useless. he also has boost which makes him faster
True you are true but it could go in both ways because if mario had the flying squirel with a turtle shell, he could jump over sonic and throw the shell and hit him or mario could jump to small and die
i did not but his shield would still protect him and his homing attack could destroy the shell, and take out Mario. also, his homing attack and boost would be able damage Mario. sonic's spin-dash would also protect him from Mario's jump while he charge the spin-dash. also while he has a ring he can't die.