Who would win in a fight sonic or luigi

No weapons: Sonic speeds around Luigi at 600 mph and smashes into him with spin dash, effectively cutting Luigi in half. Sonic wins.

Weapons: Luigi uses a star to go invincible, Sonic uses the Chaos Emeralds to go super. Tie.

Luigi because he is more determined. Determination always wins. Sonic takes his fighting as a job, not a "career".