head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Execution · Competitive PvP
Classic fighting execution and human prediction atop a famously unbalanced roster.

Execution · Competitive PvP
Weapon-based dueling testing spacing execution and mixup prediction against humans.
Mortal Kombat Trilogy leans Execution (Competitive PvP); SoulCalibur III leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat Trilogy
Dial-a-combo inputs and run-meter pressure demand fast hands
SoulCalibur III
Spacing, movement and just-frame timing demand real hands
SoulCalibur III leans a little harder on reads, though the gap is small.
Mortal Kombat Trilogy
Human opponents must be baited into unsafe moves
SoulCalibur III
Versus humans, conditioning and throw-mixup guessing decides rounds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat Trilogy
Movesets are public; nothing hidden in a match
SoulCalibur III
Deterministic combat with nothing hidden
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat Trilogy
Knowing the bloated roster's broken tech is half the battle
SoulCalibur III
Frame data, matchup study and stage knowledge run deep
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.