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

Execution · Pure Mechanics
A pure reaction-timing endurance test against accelerating random obstacles.

Execution · Pure Mechanics
Combo execution and dodge timing through scripted grindhouse brawls.
Chrome Dino leans Execution (Pure Mechanics); Shank 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.
Chrome Dino
Jump and duck timing at accelerating speed is everything
Shank
Combo juggling and dodge timing carry every brawl
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Chrome Dino
No opponent, just obstacles
Shank
Enemies and bosses attack on fixed patterns
Chrome Dino leans a little harder on variance, though the gap is small.
Chrome Dino
Obstacle order is random but instantly readable
Shank
Hand-built levels with no randomness
Shank leans a little harder on optimization, though the gap is small.
Chrome Dino
Almost nothing to plan beyond reaction discipline
Shank
Weapon-swap combo routing rewards some lab work
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.