head to head
Call of Duty: Modern Warfare 2 asks more than Tooth and Tail, and the gap is execution.

Execution · Competitive PvP
Blockbuster 2009 sequel famous for killstreak chains and frantic multiplayer.

Reads · Competitive PvP
Stripped-down RTS where fog of war and single-unit control reduce the game to reading opponent direction under uncertainty.
Call of Duty: Modern Warfare 2 leans Execution (Competitive PvP); Tooth and Tail leans Reads (Competitive PvP).
Call of Duty: Modern Warfare 2 leans clearly harder on execution.
Call of Duty: Modern Warfare 2
Fast time-to-kill rewards raw aim and reflex
Tooth and Tail
Single-unit control under fog maps precisely to mechanical skill
Tooth and Tail leans a little harder on reads, though the gap is small.
Call of Duty: Modern Warfare 2
Outguessing human rotations and flanks
Tooth and Tail
Opponent faction and expansion direction must be constantly predicted
Tooth and Tail leans a little harder on variance, though the gap is small.
Call of Duty: Modern Warfare 2
Spawn flips and killstreak randomness
Tooth and Tail
Fog of war and food spawn placement create significant hidden info
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Call of Duty: Modern Warfare 2
Killstreak economy, loadout and map knowledge
Tooth and Tail
Factory sequencing and map choke selection are learnable but flexible
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.