head to head
Neither is simply harder - they are hard in different places. BlazBlue: Calamity Trigger demands more reads; Call of Duty: Modern Warfare 2 demands more variance.

Execution · Competitive PvP
Anime fighter debuting the Drive system and famously execution-heavy cast.

Execution · Competitive PvP
Blockbuster 2009 sequel famous for killstreak chains and frantic multiplayer.
BlazBlue: Calamity Trigger leans Execution (Competitive PvP); Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP).
BlazBlue: Calamity Trigger leans a little harder on execution, though the gap is small.
BlazBlue: Calamity Trigger
Long anime combos and tight defensive inputs
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
BlazBlue: Calamity Trigger leans clearly harder on reads.
BlazBlue: Calamity Trigger
Human opponents demand constant conditioning and adaptation
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Call of Duty: Modern Warfare 2 leans clearly harder on variance.
BlazBlue: Calamity Trigger
Negligible randomness in matches
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.
BlazBlue: Calamity Trigger
Frame data, drive mechanics, and matchup study
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.