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
Out-executing and out-predicting another human in frame-precise duels.
Street Fighter II: The World Warrior leans Execution (Competitive PvP); Super Street Fighter IV: 3D Edition 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
Super Street Fighter IV: 3D Edition
Links, anti-airs and motion inputs gate every level of play
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
Super Street Fighter IV: 3D Edition
Footsies and conditioning a human opponent decide matches
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter II: The World Warrior
No meaningful RNG; match outcomes are skill-determined
Super Street Fighter IV: 3D Edition
Almost fully deterministic once inputs land
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
Super Street Fighter IV: 3D Edition
Frame data, matchup knowledge and punish routes underpin everything
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.
full breakdown
Street Fighter II: The World Warrior →
full breakdown
Super Street Fighter IV: 3D Edition →