head to head
UEFA Champions League 2006–2007 asks more than Grand Theft Auto V, and the gap is reads.

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

Execution · Practiced Mastery
Stick execution and opponent prediction inside licensed tournament football.
Grand Theft Auto V leans Execution (Practiced Mastery); UEFA Champions League 2006–2007 leans Execution (Practiced Mastery).
UEFA Champions League 2006–2007 leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
UEFA Champions League 2006–2007
Pass timing and shot placement decide most goals
UEFA Champions League 2006–2007 leans clearly harder on reads.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
UEFA Champions League 2006–2007
Human opponents bait tackles and disguise attacks
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.
UEFA Champions League 2006–2007
Deflections and AI bounces add match noise
UEFA Champions League 2006–2007 leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
UEFA Champions League 2006–2007
Squad selection and tactical setup are solvable preparation
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.