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

Execution · Pure Mechanics
A side-scrolling survival racer testing reflexes against a procedurally generated landscape.

Execution · Twitch Chaos
GameCube kart racer with two riders per kart trading items mid-drift.
Dino Run leans Execution (Pure Mechanics); Mario Kart: Double Dash!! leans Execution (Twitch Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Dino Run
Reacting to obstacles at speed is pure reflex
Mario Kart: Double Dash!!
Two-character swaps and drift timing
Mario Kart: Double Dash!! leans a little harder on reads, though the gap is small.
Dino Run
Multiplayer racing rewards minor anticipation of rivals
Mario Kart: Double Dash!!
Item duels against humans reward baiting
Mario Kart: Double Dash!! leans a little harder on variance, though the gap is small.
Dino Run
Procedural terrain creates unpredictable hazards each run
Mario Kart: Double Dash!!
Special item rolls swing races
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Dino Run
Learning to read terrain and conserve momentum helps
Mario Kart: Double Dash!!
Character pairings and lines are solved
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.