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 combo system built on constant Combo Breaker mind-games that create a unique adaptive read-off at every moment of a combo.

Execution · Grand Arena
A high-execution 3D fighter where reading opponent tendencies and optimising punishment routes defines top play.
Killer Instinct (2013) leans Execution (Grand Arena); Tekken 7 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.
Killer Instinct (2013)
Shadow counters and Combo Breaker timing demand very precise inputs
Tekken 7
Long combo strings and just-frames demand high motor precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Killer Instinct (2013)
Combo Breaker prediction is a pure read-off against an adaptive opponent
Tekken 7
Reading opponent's defensive tendencies and rage art timing is constant
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Killer Instinct (2013)
No RNG; all mechanics are fully visible
Tekken 7
No RNG; all information is visible in the match
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Killer Instinct (2013)
Instinct activation timing and optimal opener routes are well-studied
Tekken 7
Rage Art/Drive usage, wall carry routes, and frame data heavily studied
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.