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 · Competitive PvP
The definitive classic Street Fighter II revision and a founding tournament fighter.
SoulCalibur VI leans Execution (Grand Arena); Super Street Fighter II Turbo leans Execution (Competitive PvP).
Super Street Fighter II Turbo leans a little harder on execution, though the gap is small.
SoulCalibur VI
Reversal Edge timing and long lethal hit strings require tight execution
Super Street Fighter II Turbo
One-frame links, charge timing, and strict motions
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
Super Street Fighter II Turbo
Footsies and throw mixups against an adapting human
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
Super Street Fighter II Turbo
Minor damage variation; everything else visible
SoulCalibur VI leans a little harder on optimization, though the gap is small.
SoulCalibur VI
Soul Charge routes and matchup character knowledge reward study
Super Street Fighter II Turbo
Matchup knowledge and super meter spend are studied lines
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.