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

Execution · Pure Mechanics
Dodging scripted bullet patterns with stage memorisation doing the planning.

Execution · Pure Mechanics
Precision 3D platformer of narrow corridors, crates, and unforgiving jumps.
Air Buster leans Execution (Pure Mechanics); Crash Bandicoot leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Air Buster
Bullet weaving and tight corridors demand precise control
Crash Bandicoot
Tight jumps on narrow paths punish slop
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Air Buster
Enemy waves are fully scripted patterns
Crash Bandicoot
Hazards are fixed patterns
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Air Buster
Spawns are deterministic once a credit is studied
Crash Bandicoot
Everything scripted and placed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Air Buster
Memorising stage layouts and power-up routes drives clears
Crash Bandicoot
Box routes and gem requirements are learnable
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.