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
Sequel that trims the open world and doubles down on stylish assassin duels.
Grand Theft Auto V leans Execution (Practiced Mastery); No More Heroes 2: Desperate Struggle leans Execution (Practiced Mastery).
No More Heroes 2: Desperate Struggle leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
No More Heroes 2: Desperate Struggle
Faster boss duels with dodge timing
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
No More Heroes 2: Desperate Struggle
Scripted assassin patterns
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
No More Heroes 2: Desperate Struggle
Fixed fights, retro minigames
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Grand Theft Auto V
Heists, money loops, builds learnable.
No More Heroes 2: Desperate Struggle
Pattern study and ability upgrades
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.