Who Would Win?

Buffy Anne Summers

Slayer ; (formerly) Waitress ; DoubleMeat Palace employee ; Sunnydale High Counselor

Slayer Strength, Superhuman Speed, Enhanced Durability, Accelerated Healing, Prophetic Dreams, Expert Martial Artist, Weapons Proficiency

Stakes, Crossbow, Scythe, Holy Water

Slayer Army, Scooby Gang, (formerly) The Initiative, Watchers Council

Mar-Vell

Air Force pilot, Avenger, cosmic protector

Energy Absorption, Photon Blasts, Flight, Superhuman Strength, Superhuman Durability, Binary Form, Cosmic Awareness

Kree-enhanced suit — relies on cosmic energy absorption powers

currently Avengers, former companion to the X-Men (as Carol Danvers), former member of the Starjammers (as Binary), Former Avenger (as Ms. Marvel)