head to head
Sonic Adventure 2: Battle asks more than Grand Theft Auto V, and the gap is optimization.

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

Execution · Practiced Mastery
Memorising stage routes and executing them cleanly for ranks and speed.
Grand Theft Auto V leans Execution (Practiced Mastery); Sonic Adventure 2: Battle leans Execution (Practiced Mastery).
Sonic Adventure 2: Battle leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Sonic Adventure 2: Battle
Speed-stage control and rail precision reward clean hands
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 Adventure 2: Battle
Two-player battles exist but stay shallow and scripted
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 Adventure 2: Battle
Stages are fixed; Chao stats are deterministic grinding
Sonic Adventure 2: Battle leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Sonic Adventure 2: Battle
Rank chasing means memorising routes and score lines
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.