head to head
Call of Duty: Black Ops asks more than NBA 2K15, and the gap is execution.

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

Execution · Competitive PvP
Tests shot timing and play-calling prediction against human defenders.
Call of Duty: Black Ops leans Execution (Competitive PvP); NBA 2K15 leans Execution (Competitive PvP).
Call of Duty: Black Ops leans clearly harder on execution.
Call of Duty: Black Ops
Gunfights hinge on aim and reaction speed
NBA 2K15
Shot-stick timing and dribble moves demand practiced hands
Call of Duty: Black Ops leans a little harder on reads, though the gap is small.
Call of Duty: Black Ops
Reading human opponents' positioning and timing
NBA 2K15
Versus humans, baiting defenders and calling counters drives possessions
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
NBA 2K15
Shot RNG and loose balls swing close games
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
NBA 2K15
Playbooks, matchups and roster management reward system study
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.