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
An early arcade racer testing reaction dodges and memorised obstacle patterns against the clock.

Execution · Pure Mechanics
Open-world racing testing car control and line discipline with light tuning underneath.
Antarctic Adventure leans Execution (Pure Mechanics); Forza Horizon 2 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.
Antarctic Adventure
Dodging crevasses and seals at speed is the entire game
Forza Horizon 2
Racing lines, braking points and car control lead everything
Forza Horizon 2 leans a little harder on reads, though the gap is small.
Antarctic Adventure
Hazards scroll in on fixed arcade patterns
Forza Horizon 2
Drivatar AI mimics styles but stays effectively scripted
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Antarctic Adventure
Obstacle layouts repeat and are quickly memorised
Forza Horizon 2
Weather shifts grip slightly; courses are fully known
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Antarctic Adventure
Learning hazard patterns and speed management raises scores
Forza Horizon 2
Car tuning and route knowledge reward preparation
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.