head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Grand Arena
A 2D fighting game where execution meets relentless yomi at neutral.

Execution · Grand Arena
A 3D fighter where movement and mixup reads decide rounds.
Street Fighter 6 leans Execution (Grand Arena); Tekken 8 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.
Street Fighter 6
Frame-perfect inputs and combos are mandatory.
Tekken 8
Just-frame inputs and 3D movement punish sloppy hands.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter 6
Adaptive opponent baits Drive Impacts and throws.
Tekken 8
Adaptive opponents mix lows, highs, and throws.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter 6
Essentially no randomness in match outcomes.
Tekken 8
Negligible RNG in core matches.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Street Fighter 6
Matchup charts, frame data, and combo routes.
Tekken 8
Frame data, punishes, and movelist depth.
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.