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 high-execution 3D fighter where reading opponent tendencies and optimising punishment routes defines top play.

Execution · Grand Arena
A hyper-fast tag fighting game defined by three-character teams and touch-of-death combos.
Tekken 7 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 7
Long combo strings and just-frames demand high motor precision
Ultimate Marvel vs. Capcom 3
Long touch-of-death combos demand elite hands
Tekken 7 leans a little harder on reads, though the gap is small.
Tekken 7
Reading opponent's defensive tendencies and rage art timing is constant
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 7
No RNG; all information is visible in the match
Ultimate Marvel vs. Capcom 3
Almost fully deterministic
Tekken 7 leans a little harder on optimization, though the gap is small.
Tekken 7
Rage Art/Drive usage, wall carry routes, and frame data heavily studied
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.