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
The foundational test of fighting-game execution and human prediction at speed.

Execution · Competitive PvP
A combo-heavy 3D fighter where lab-trained hands meet live human prediction.
Street Fighter II' Turbo leans Execution (Competitive PvP); Tekken 6 leans Execution (Competitive PvP).
Tekken 6 leans a little harder on execution, though the gap is small.
Street Fighter II' Turbo
Charge timing and anti-air reactions at turbo speed
Tekken 6
Bound combos and movement push a high physical ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter II' Turbo
Fireball-trap mind games against an adapting human are the essence
Tekken 6
Rage comebacks amplify the human guessing game
Tekken 6 leans a little harder on variance, though the gap is small.
Street Fighter II' Turbo
Twelve public movesets, nothing hidden
Tekken 6
Visible state; nothing meaningfully random
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter II' Turbo
Matchup theory and spacing fundamentals were codified here
Tekken 6
Optimal bound routes and punishment charts are lab work
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.