head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, and it is a single point.

Execution · Grand Arena
A fast anime fighter where execution and yomi compound under pressure.

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.
Guilty Gear Strive leans Execution (Grand Arena); Killer Instinct (2013) 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.
Guilty Gear Strive
Tight links, RCs, and burst timing are demanding.
Killer Instinct (2013)
Shadow counters and Combo Breaker timing demand very precise inputs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Guilty Gear Strive
Adaptive opponents bait Roman Cancels and throws.
Killer Instinct (2013)
Combo Breaker prediction is a pure read-off against an adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Guilty Gear Strive
Essentially deterministic match flow.
Killer Instinct (2013)
No RNG; all mechanics are fully visible
Killer Instinct (2013) leans a little harder on optimization, though the gap is small.
Guilty Gear Strive
Matchup data, combo routes, and tension management.
Killer Instinct (2013)
Instinct activation timing and optimal opener routes are well-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.