head to head
Neither is simply harder - they are hard in different places. Grand Theft Auto V demands more reads; Project Wingman demands more execution.

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

Execution · Practiced Mastery
An indie love letter to arcade flight combat with relentless missile-dodging dogfights.
Grand Theft Auto V leans Execution (Practiced Mastery); Project Wingman leans Execution (Practiced Mastery).
Project Wingman leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Project Wingman
Dense missile spam demands constant evasive flying and aim.
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Project Wingman
Enemy aces are scripted set pieces.
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.
Project Wingman
Fixed missions; conquest mode adds light randomness.
Project Wingman leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Project Wingman
Loadout choice and learned mission flow decide harder difficulties.
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.