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
Frantic tag-team fighter crossing Capcom's mutants with World Warriors.
Tekken 7 leans Execution (Grand Arena); X-Men vs. Street Fighter 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
X-Men vs. Street Fighter
Infinite combos and tag execution demand serious 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
X-Men vs. Street Fighter
Human opponents adapt mixups every round.
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
X-Men vs. Street Fighter
Fully visible game state.
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
X-Men vs. Street Fighter
Team synergy and matchup theory reward lab time.
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.