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.

Reads · Competitive PvP
The 2011 reboot that returned Mortal Kombat to brutal 2D fighting fundamentals.

Execution · Grand Arena
A weapons-based 3D fighter where Reversal Edge decisions and ring positioning create constant human reads.
Mortal Kombat leans Reads (Competitive PvP); SoulCalibur VI leans Execution (Grand Arena).
SoulCalibur VI leans a little harder on execution, though the gap is small.
Mortal Kombat
Combo execution and punish timing
SoulCalibur VI
Reversal Edge timing and long lethal hit strings require tight execution
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat
Human opponents adapt; conditioning and counter-guessing rule
SoulCalibur VI
Reversal Edge is a pure read-off mechanic against human opponents
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat
Near-deterministic systems
SoulCalibur VI
No RNG; ring position is full information
SoulCalibur VI leans a little harder on optimization, though the gap is small.
Mortal Kombat
Frame data and matchup study converge to known answers
SoulCalibur VI
Soul Charge routes and matchup character knowledge reward study
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.