Black Widow (aka Natalia Romonova)
Abilities:
Extensive training in military operations
Hand-to-hand combatant
Martial artist
Spy
Slowed aging
Enhanced psychological defenses and immune system
Abnormally superior athletic condition
Hypnosis
Or
Gamora
Abilities:
Superhuman strength
Speed
Agility
Durability
Highly skilled gymnast and assassin
Accelerated healing factor
Skilled martial artist
Which badass superhero would win in a fight? 
