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 Stone-powered tag fighter where Infinity Stone selection and team synergy drive the competitive meta.

Execution · Competitive PvP
A combo-heavy 3D fighter where lab-trained hands meet live human prediction.
Marvel vs. Capcom: Infinite leans Execution (Grand Arena); Tekken 6 leans Execution (Competitive PvP).
Tekken 6 leans a little harder on execution, though the gap is small.
Marvel vs. Capcom: Infinite
Infinity Stone tag combos require practiced execution
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.
Marvel vs. Capcom: Infinite
Stone selection counter-picks and team tendency reads against humans
Tekken 6
Rage comebacks amplify the human guessing game
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Marvel vs. Capcom: Infinite
No RNG; all information is visible
Tekken 6
Visible state; nothing meaningfully random
Marvel vs. Capcom: Infinite leans a little harder on optimization, though the gap is small.
Marvel vs. Capcom: Infinite
Stone pairing meta and team routing reward structured study
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.