head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.

Execution · Practiced Mastery
A co-op puzzle-platformer that tests physical coordination and communication across a wide variety of co-designed mechanics.
Grand Theft Auto V leans Execution (Practiced Mastery); It Takes Two leans Execution (Practiced Mastery).
It Takes Two leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
It Takes Two
Co-op platforming demands tight timing, coordination, and spatial precision
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
It Takes Two
Human partner requires some coordination reads but not competitive prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Some mission and lobby randomness.
It Takes Two
Puzzle solutions are fixed; little hidden randomness
It Takes Two leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
It Takes Two
Each chapter has an optimal movement approach once mechanics are learned
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.