head to head
Call of Duty: Black Ops asks more than Mortal Kombat: Armageddon, and the gap is variance.

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

Execution · Competitive PvP
Fighting-game execution and opponent prediction across an enormous, loosely balanced roster.
Call of Duty: Black Ops leans Execution (Competitive PvP); Mortal Kombat: Armageddon leans Execution (Competitive PvP).
Call of Duty: Black Ops leans a little harder on execution, though the gap is small.
Call of Duty: Black Ops
Gunfights hinge on aim and reaction speed
Mortal Kombat: Armageddon
Combo strings and kombat timing decide exchanges
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
Mortal Kombat: Armageddon
Versus humans, baiting and punishing habits is the meta
Call of Duty: Black Ops leans clearly harder on variance.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
Mortal Kombat: Armageddon
No hidden information once movesets are known
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
Mortal Kombat: Armageddon
A 62-character roster of matchup knowledge to internalise
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.