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
The trilogy capper adding a Batmobile to the familiar freeflow formula.

Execution · Practiced Mastery
An action adventure rewarding combat timing against scripted boss patterns.
Batman: Arkham Knight leans Execution (Practiced Mastery); God of War Ragnarok leans Execution (Practiced Mastery).
God of War Ragnarok leans a little harder on execution, though the gap is small.
Batman: Arkham Knight
Combat and Batmobile control need timing.
God of War Ragnarok
Parry timing and combo execution in combat
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Batman: Arkham Knight
Scripted enemy AI.
God of War Ragnarok
Bosses use fixed movesets
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Batman: Arkham Knight
Deterministic encounters.
God of War Ragnarok
Negligible randomness
God of War Ragnarok leans a little harder on optimization, though the gap is small.
Batman: Arkham Knight
Gadget chains and tank routes learnable.
God of War Ragnarok
Build choices and moveset mastery solve bosses
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.