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 · Grand Arena
A weapons-based 3D fighter where Reversal Edge decisions and ring positioning create constant human reads.

Execution · Grand Arena
A high-execution fighter where one-frame links and opponent modelling separate competitors.
SoulCalibur VI leans Execution (Grand Arena); Street Fighter IV leans Execution (Grand Arena).
Street Fighter IV leans a little harder on execution, though the gap is small.
SoulCalibur VI
Reversal Edge timing and long lethal hit strings require tight execution
Street Fighter IV
One-frame links and FADC combos demand extreme motor precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
SoulCalibur VI
Reversal Edge is a pure read-off mechanic against human opponents
Street Fighter IV
Reading opponent habits, wake-up patterns, and adaptations is the meta
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
SoulCalibur VI
No RNG; ring position is full information
Street Fighter IV
Virtually no RNG; every outcome is skill-driven
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
SoulCalibur VI
Soul Charge routes and matchup character knowledge reward study
Street Fighter IV
Frame data, punish windows, and matchup charts are deeply studied
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.