head to head
Real Soccer 2009 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
A mobile soccer simulation game.
Grand Theft Auto V leans Execution (Practiced Mastery); Real Soccer 2009 leans Execution (Practiced Mastery).
Real Soccer 2009 leans clearly harder on execution.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Real Soccer 2009
passing and shooting precision are core skills
Real Soccer 2009 leans a little harder on reads, though the gap is small.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Real Soccer 2009
AI defense has limited adaptive counterplay
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.
Real Soccer 2009
minor randomness in ball physics/outcomes
Real Soccer 2009 leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Real Soccer 2009
formation and tactics are learnable
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.