head to head
Call of Duty: Modern Warfare 2 asks more than Arcana Heart 3, and the gap is variance.

Execution · Competitive PvP
An air-dash anime fighter where pairing each girl with an elemental Arcana doubles the roster math.

Execution · Competitive PvP
Blockbuster 2009 sequel famous for killstreak chains and frantic multiplayer.
Arcana Heart 3 leans Execution (Competitive PvP); Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Arcana Heart 3
Homing dashes and extended air combos need fast precise inputs.
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
Arcana Heart 3 leans a little harder on reads, though the gap is small.
Arcana Heart 3
Full-screen approach mixups against humans stay adaptive.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Call of Duty: Modern Warfare 2 leans clearly harder on variance.
Arcana Heart 3
Deterministic; arcana chosen openly.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Arcana Heart 3
Character-arcana pairings multiply the labbable matchup space.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
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.