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

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

Execution · Competitive PvP
A tactical shooter where precise gunplay against human opposition is the deciding skill.
Call of Duty: Black Ops leans Execution (Competitive PvP); Counter-Strike: Condition Zero 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
Counter-Strike: Condition Zero
aim and spray control decide duels
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
Counter-Strike: Condition Zero
predicting human opponent positioning
Call of Duty: Black Ops leans a little harder on variance, though the gap is small.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
Counter-Strike: Condition Zero
buy-round economy and drops vary slightly
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
Counter-Strike: Condition Zero
economy management and utility usage 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.