head to head
Neither is simply harder - they are hard in different places. Call of Duty: Black Ops demands more execution; The Isle demands more variance.

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

Reads · Competitive PvP
Open-world survival sandbox where every dinosaur stalking you is another player.
Call of Duty: Black Ops leans Execution (Competitive PvP); The Isle leans Reads (Competitive PvP).
Call of Duty: Black Ops leans clearly harder on execution.
Call of Duty: Black Ops
Gunfights hinge on aim and reaction speed
The Isle
Stamina management and pounce timing in chases
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
The Isle
Human-controlled dinosaurs ambush and bait
The Isle leans clearly harder on variance.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
The Isle
Open server world hides who is nearby
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
The Isle
Growth stages, diets, and territory 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.