head to head
Call of Duty: Black Ops asks more than Battlefield 1942, and the gap is execution.

Execution · Competitive PvP
The pioneering large-scale WWII shooter built on combined-arms map chaos.

Execution · Competitive PvP
Cold War-era shooter pairing twitch multiplayer with the cult Zombies mode.
Battlefield 1942 leans Execution (Competitive PvP); Call of Duty: Black Ops leans Execution (Competitive PvP).
Call of Duty: Black Ops leans clearly harder on execution.
Battlefield 1942
Aim, vehicle handling, and leading shots matter.
Call of Duty: Black Ops
Gunfights hinge on aim and reaction speed
Call of Duty: Black Ops leans clearly harder on reads.
Battlefield 1942
Human teams adapt flanks and vehicle pushes.
Call of Duty: Black Ops
Reading human opponents' positioning and timing
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Battlefield 1942
64-player chaos and spawns add noise.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
Call of Duty: Black Ops leans a little harder on optimization, though the gap is small.
Battlefield 1942
Map control and vehicle timing learnable.
Call of Duty: Black Ops
Class builds, map control, zombies routing
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.