head to head
Need for Speed: High Stakes asks more than Grand Theft Auto V, and the gap is execution.

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

Execution · Practiced Mastery
Clean driving lines under pursuit pressure, with an economy that punishes crashing.
Grand Theft Auto V leans Execution (Practiced Mastery); Need for Speed: High Stakes leans Execution (Practiced Mastery).
Need for Speed: High Stakes leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Need for Speed: High Stakes
Cornering and racing lines at speed are the whole test
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.
Need for Speed: High Stakes
Police and rivals follow predictable AI routines
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.
Need for Speed: High Stakes
Traffic placement adds mild run-to-run chaos
Need for Speed: High Stakes leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Need for Speed: High Stakes
Car choice, upgrades and career economy reward planning
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.