head to head
Call of Duty: Black Ops asks more than Ready 2 Rumble Boxing, and the gap is execution.

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

Execution · Competitive PvP
Arcade punch timing with counter prediction in human bouts.
Call of Duty: Black Ops leans Execution (Competitive PvP); Ready 2 Rumble Boxing 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
Ready 2 Rumble Boxing
Punch timing, dodges and rumble combos reward quick hands
Call of Duty: Black Ops leans clearly harder on reads.
Call of Duty: Black Ops
Reading human opponents' positioning and timing
Ready 2 Rumble Boxing
Human bouts become feint-and-counter prediction
Call of Duty: Black Ops leans clearly harder on variance.
Call of Duty: Black Ops
Spawns, care packages, zombies RNG
Ready 2 Rumble Boxing
Nothing hidden once boxers are learned
Call of Duty: Black Ops leans clearly harder on optimization.
Call of Duty: Black Ops
Class builds, map control, zombies routing
Ready 2 Rumble Boxing
Boxer matchups and rumble meter use are quickly mapped
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.