Who Would Win?

Leonardo

Ninja

Ninjutsu Mastery, Twin Katana Swordsmanship, Leadership, Tactical Strategy, Stealth, Enhanced Agility

Twin Katanas, Shuriken

Teenage Mutant Ninja Turtles

Thor Odinson

Prince of Asgard, God of Thunder

Flight, Super Strength, Super Speed, Agility, Stamina, Invulnerability, Teleport, Force Field, Blast Power, Healing, Magic, Weapon Master, Super Sight, Super Smell, Super Hearing, Phasing / Ghost, Magnetism, Unarmed Combat, Weather Control, Divine Powers, Immortal, Necromancy, Electricity Control, Sub-Mariner, Mesmerize, Astral Projection, Danger Sense, Adaptive, Electronic interaction, Animation, Energy-Enhanced Strike, Light Projection, Reality Manpulation, Electronic Disruption, Soul Absorption, Dimensional Manipulation, Omni-lingual, Energy Shield, Siphon Lifeforce, Sense Death, Darkforce Manipulation, Vibration Wave, Empathy, Illusion Casting, Wind Bursts, Earth Manipulation, Marksmanship, Power Item, Hypnosis, Water Control, Energy Absorption, Energy Manipulation, Cosmic Awareness, Chemical Absorbtion, Berserker Strength, Leadership, Longevity, Ice Breath

Mjolnir (enchanted hammer), Stormbreaker (axe), Megingjord (belt of strength), Jarnbjorn (axe)

Asgardian Gods, Avengers, Avengers 1,000 AD, Avengers Crew, Avengers Infinity, Avengers Unity Squad, Circus of Crime, Cosmic Avengers, Cosmic Champions, Council of Godheads, European Defense Initiative, Frogs of Central Park, Godpack, Great Powers of the Universe, Guardians of the Galaxy, Heralds of Galactus, Holy Guard, Human High Council, League of Realms , Legion of the Unliving, Secret Avengers, Super Hero Squad, Super-Axis, The Chronos Corps, The Galactic Avenger Battalion, The God Squad, Thor Corps, Time-Plucked Titans, Ultimates, Vizier's Guard