head to head
Call of Duty: Modern Warfare 2 asks more than Sonic Battle, and the gap is execution.

Execution · Competitive PvP
Blockbuster 2009 sequel famous for killstreak chains and frantic multiplayer.

Execution · Competitive PvP
Tests arena brawling timing and skill-build crafting against human opponents.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); Sonic Battle leans Execution (Competitive PvP).
Call of Duty: Modern Warfare 2 leans clearly harder on execution.
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
Sonic Battle
Aerial juggles and guard timing on a grid arena
Call of Duty: Modern Warfare 2 leans a little harder on reads, though the gap is small.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Sonic Battle
Versus humans, baiting special skill choices is the edge
Call of Duty: Modern Warfare 2 leans clearly harder on variance.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
Sonic Battle
Little randomness beyond skill-card drops
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
Sonic Battle
Custom skill builds for Emerl define the meta
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.