head to head
Call of Duty: Black Ops asks more than Fight Night Round 3, and the gap is variance.

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

Execution · Competitive PvP
An analog-control boxing game where parry timing and feints decide versus bouts.
Call of Duty: Black Ops leans Execution (Competitive PvP); Fight Night Round 3 leans Execution (Competitive PvP).
Call of Duty: Black Ops leans a little harder on execution, though the gap is small.
Call of Duty: Black Ops
Gunfights hinge on aim and reaction speed
Fight Night Round 3
Analog punch swings and parry timing set the skill ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Black Ops
Reading human opponents' positioning and timing
Fight Night Round 3
Versus boxing is feinting and baiting an adapting human
Call of Duty: Black Ops leans clearly harder on variance.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
Fight Night Round 3
Minor cut and stun randomness
Call of Duty: Black Ops leans a little harder on optimization, though the gap is small.
Call of Duty: Black Ops
Class builds, map control, zombies routing
Fight Night Round 3
Stamina management and fighter builds are studyable
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.