head to head
Neither is simply harder - they are hard in different places. Call of Duty: Modern Warfare 2 demands more variance; Super Street Fighter IV: 3D Edition demands more reads.

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

Execution · Competitive PvP
Out-executing and out-predicting another human in frame-precise duels.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); Super Street Fighter IV: 3D Edition 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.
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
Super Street Fighter IV: 3D Edition
Links, anti-airs and motion inputs gate every level of play
Super Street Fighter IV: 3D Edition leans clearly harder on reads.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Super Street Fighter IV: 3D Edition
Footsies and conditioning a human opponent decide matches
Call of Duty: Modern Warfare 2 leans clearly harder on variance.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
Super Street Fighter IV: 3D Edition
Almost fully deterministic once inputs land
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
Super Street Fighter IV: 3D Edition
Frame data, matchup knowledge and punish routes underpin everything
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.