head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Competitive PvP
A test of precise inputs and constant human prediction across a fixed roster of matchup puzzles.

Execution · Competitive PvP
The foundational test of fighting-game execution and human prediction at speed.
Street Fighter II: The World Warrior leans Execution (Competitive PvP); Street Fighter II' Turbo leans Execution (Competitive PvP).
Street Fighter II: The World Warrior leans a little harder on execution, though the gap is small.
Street Fighter II: The World Warrior
Frame-precise inputs and combo timing define every matchup
Street Fighter II' Turbo
Charge timing and anti-air reactions at turbo speed
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter II: The World Warrior
Predicting human opponent's next move is constant and non-convergent
Street Fighter II' Turbo
Fireball-trap mind games against an adapting human are the essence
Street Fighter II: The World Warrior leans a little harder on variance, though the gap is small.
Street Fighter II: The World Warrior
No meaningful RNG; match outcomes are skill-determined
Street Fighter II' Turbo
Twelve public movesets, nothing hidden
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter II: The World Warrior
Character matchups and punish routes are learnable but not fully solvable
Street Fighter II' Turbo
Matchup theory and spacing fundamentals were codified here
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.