head to head
Syphon Filter 3 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
Learning scripted mission layouts and executing aim and stealth under pressure.
Grand Theft Auto V leans Execution (Practiced Mastery); Syphon Filter 3 leans Execution (Practiced Mastery).
Syphon Filter 3 leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Syphon Filter 3
Aim, taser timing and stealth movement carry encounters
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.
Syphon Filter 3
Enemies run fixed scripts, never model the player
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.
Syphon Filter 3
Enemy placements are scripted-but-unknown on first runs
Syphon Filter 3 leans clearly harder on optimization.
Grand Theft Auto V
Heists, money loops, builds learnable.
Syphon Filter 3
Routes, gadget use and mission layouts are fully 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.