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

Execution · Practiced Mastery
Underwater dogfighting testing piloting and aim through scripted missions.

Execution · Pure Mechanics
Open-world racing testing car control and line discipline with light tuning underneath.
AquaNox leans Execution (Practiced Mastery); Forza Horizon 2 leans Execution (Pure Mechanics).
Forza Horizon 2 leans a little harder on execution, though the gap is small.
AquaNox
Six-degree underwater dogfighting demands piloting and aim
Forza Horizon 2
Racing lines, braking points and car control lead everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
AquaNox
Mission enemies attack on fixed scripts
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.
AquaNox
Missions play out identically each attempt
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.
AquaNox
Ship loadout and weapon choice add modest planning
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.