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
Tests handheld drift-racing execution on short memorisable circuits.
Grand Theft Auto V leans Execution (Practiced Mastery); Sonic Drift 2 leans Execution (Practiced Mastery).
Sonic Drift 2 leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Sonic Drift 2
Drift timing on tiny Game Gear tracks decides races
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 Drift 2
AI racers follow fixed lines; link-cable duels are rare
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.
Sonic Drift 2
Item pickups add mild race randomness
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.
Sonic Drift 2
Character choice and track lines have learnable optima
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.