head to head
Neither is simply harder - they are hard in different places. Call of Duty: Black Ops demands more variance; Persona 4 Arena demands more reads.

Execution · Competitive PvP
Cold War-era shooter pairing twitch multiplayer with the cult Zombies mode.

Execution · Competitive PvP
Combo execution and endless mixup prediction against adapting human opponents.
Call of Duty: Black Ops leans Execution (Competitive PvP); Persona 4 Arena 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: Black Ops
Gunfights hinge on aim and reaction speed
Persona 4 Arena
Combo execution and confirm timing gate competitive play
Persona 4 Arena leans clearly harder on reads.
Call of Duty: Black Ops
Reading human opponents' positioning and timing
Persona 4 Arena
Mixups and throw-tech guessing against adapting humans never converge
Call of Duty: Black Ops leans clearly harder on variance.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
Persona 4 Arena
Almost nothing random in a fighting match
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Black Ops
Class builds, map control, zombies routing
Persona 4 Arena
Frame data, matchup study and meter math reward homework
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.