head to head
Neither is simply harder - they are hard in different places. Disney's Goof Troop demands more optimization; Grand Theft Auto V demands more reads.

Optimization · Practiced Mastery
Co-op block-puzzle rooms with light action, each with one clean solution.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Disney's Goof Troop leans Optimization (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Grand Theft Auto V leans a little harder on execution, though the gap is small.
Disney's Goof Troop
Dodging pirates and throwing blocks needs modest timing
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans clearly harder on reads.
Disney's Goof Troop
Pirates follow simple fixed movement, no adaptation
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Disney's Goof Troop
Room contents are unknown only on first play
Grand Theft Auto V
Some mission and lobby randomness.
Disney's Goof Troop leans clearly harder on optimization.
Disney's Goof Troop
Block-pushing puzzle rooms each have a discoverable solution
Grand Theft Auto V
Heists, money loops, builds learnable.
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.