head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Pure Mechanics
A fast military shooter where twitch aim against human opponents defines success.

Execution · Competitive PvP
A beloved movement shooter pairing an execution-heavy campaign with adaptive pilot duels.
Call of Duty: Black Ops 4 leans Execution (Pure Mechanics); Titanfall 2 leans Execution (Competitive PvP).
Call of Duty: Black Ops 4 leans a little harder on execution, though the gap is small.
Call of Duty: Black Ops 4
aim and reflexes decide most fights
Titanfall 2
Slide-hopping and aim under speed set a high 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 4
predicting human opponents' positioning
Titanfall 2
Multiplayer pilots out-position and out-guess each other
Call of Duty: Black Ops 4 leans a little harder on variance, though the gap is small.
Call of Duty: Black Ops 4
battle royale loot is heavily random
Titanfall 2
Flank uncertainty and titanfall timing only
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 4
loadouts and rotations are solvable
Titanfall 2
Campaign gauntlets and loadout synergies are solvable
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.