head to head
Grand Theft Auto V asks more than Hill Climb Racing 2, and the gap is reads.

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

Execution · Practiced Mastery
Balancing a physics vehicle over terrain while upgrade math sets your ceiling.
Grand Theft Auto V leans Execution (Practiced Mastery); Hill Climb Racing 2 leans Execution (Practiced Mastery).
Hill Climb Racing 2 leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Hill Climb Racing 2
Throttle-and-brake balance over physics terrain decides every run
Grand Theft Auto V leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Hill Climb Racing 2
Async opponents are ghosts, nothing to predict live
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.
Hill Climb Racing 2
Procedural terrain segments add mild run-to-run noise
Hill Climb Racing 2 leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Hill Climb Racing 2
Vehicle choice, tuning and upgrade paths set the ceiling
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.