head to head
Call of Duty: Black Ops 6 asks more than Quake Live, and the gap is variance.

Execution · Grand Arena
Movement-heavy modern COD arena shooter.

Execution · Pure Mechanics
Browser-era refinement of Quake III, the benchmark for raw arena FPS skill.
Call of Duty: Black Ops 6 leans Execution (Grand Arena); Quake Live leans Execution (Pure Mechanics).
Quake Live leans a little harder on execution, though the gap is small.
Call of Duty: Black Ops 6
Omnimovement raises the aim ceiling
Quake Live
Rail aim and strafe-jump movement are the purest hand test
Quake Live leans a little harder on reads, though the gap is small.
Call of Duty: Black Ops 6
Slide-cancel duels are pure prediction
Quake Live
Duels are mind games against an adapting human opponent
Call of Duty: Black Ops 6 leans clearly harder on variance.
Call of Duty: Black Ops 6
Spawns and SBMM still vary matches
Quake Live
Symmetric arenas, full information, almost no randomness
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 6
Attachment tuning and perk synergy deep
Quake Live
Item timing and map control are deeply 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.