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 · Grand Arena
A 3D fighter where movement and mixup reads decide rounds.

Execution · Grand Arena
A hyper-fast tag fighting game defined by three-character teams and touch-of-death combos.
Tekken 8 leans Execution (Grand Arena); Ultimate Marvel vs. Capcom 3 leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Tekken 8
Just-frame inputs and 3D movement punish sloppy hands.
Ultimate Marvel vs. Capcom 3
Long touch-of-death combos demand elite hands
Tekken 8 leans a little harder on reads, though the gap is small.
Tekken 8
Adaptive opponents mix lows, highs, and throws.
Ultimate Marvel vs. Capcom 3
Mixups and assist baits versus adapting humans
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Tekken 8
Negligible RNG in core matches.
Ultimate Marvel vs. Capcom 3
Almost fully deterministic
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Tekken 8
Frame data, punishes, and movelist depth.
Ultimate Marvel vs. Capcom 3
Team composition and matchup 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.