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 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
Often called the most pure expression of high-level 3D fighting, built almost entirely on frame-data optimisation and throw-tech reads.
Killer Instinct (2013) leans Execution (Grand Arena); Virtua Fighter 5: Final Showdown 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
Virtua Fighter 5: Final Showdown
Precise evade directions and just-frame throws set a high execution standard
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
Virtua Fighter 5: Final Showdown
Throw-tech guessing and opponent tendency exploitation are the core loop
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
Virtua Fighter 5: Final Showdown
No RNG; all information is transparent
Virtua Fighter 5: Final Showdown leans a little harder on optimization, though the gap is small.
Killer Instinct (2013)
Instinct activation timing and optimal opener routes are well-studied
Virtua Fighter 5: Final Showdown
Throw-tech rates, evade directions, and frame data are extensively 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.