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

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

Execution · Practiced Mastery
Stylish aim and slow-motion positioning against waves of scripted goons.
AquaNox leans Execution (Practiced Mastery); Stranglehold leans Execution (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
AquaNox
Six-degree underwater dogfighting demands piloting and aim
Stranglehold
Slow-motion dive-shooting still rewards aim and style timing
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
Stranglehold
Goons spawn in scripted waves, never adapting
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
Stranglehold
Destructible arenas play out the same each run
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
Stranglehold
Style-point economy and Tequila Time management 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.