head to head
Sonic Riders: Zero Gravity 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
Hoverboard racing built on trick timing and learned gravity-shortcut routes.
Grand Theft Auto V leans Execution (Practiced Mastery); Sonic Riders: Zero Gravity leans Execution (Practiced Mastery).
Sonic Riders: Zero Gravity leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Sonic Riders: Zero Gravity
Trick timing and gravity maneuvers demand constant precise inputs
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.
Sonic Riders: Zero Gravity
Versus mode adds minimal opponent prediction
Grand Theft Auto V leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Sonic Riders: Zero Gravity
Tracks are fixed; almost nothing hidden
Sonic Riders: Zero Gravity leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Sonic Riders: Zero Gravity
Gear choice and gravity-shortcut routing separate the field
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.