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
A chaotic co-op platformer mixing precise jumps with friendly betrayal.
AquaNox leans Execution (Practiced Mastery); BattleBlock Theater 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
BattleBlock Theater
Precise jumps and tosses under pressure.
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
BattleBlock Theater
Versus mode adds light human chaos.
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
BattleBlock Theater
Levels fixed.
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
BattleBlock Theater
Gem routes and weapon picks 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.