head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Patapon Remastered demands more optimization.

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

Optimization · Practiced Mastery
A rhythm-strategy game commanding tribal warriors through drumbeat commands.
Grand Theft Auto V leans Execution (Practiced Mastery); Patapon Remastered leans Optimization (Practiced Mastery).
Patapon Remastered leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Patapon Remastered
Rhythm-timing inputs are the core execution challenge.
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Patapon Remastered
No adaptive opponent, scripted enemy encounters.
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.
Patapon Remastered
Some randomized loot and item drops.
Patapon Remastered leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Patapon Remastered
Unit composition and rhythm-command strategy are deeply solvable.
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.