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.

Optimization · Practiced Mastery
A tap-to-shoot defense game balancing aim with weapon upgrade choices.
Grand Theft Auto V leans Execution (Practiced Mastery); Swamp Attack leans Optimization (Practiced Mastery).
Grand Theft Auto V leans a little harder on execution, though the gap is small.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Swamp Attack
Tap-aiming at incoming enemies needs modest timing
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.
Swamp Attack
Waves are scripted, no adaptive opponent
Swamp Attack leans a little harder on variance, though the gap is small.
Grand Theft Auto V
Some mission and lobby randomness.
Swamp Attack
Enemy spawn mix adds some randomness across waves
Swamp Attack leans a little harder on optimization, though the gap is small.
Grand Theft Auto V
Heists, money loops, builds learnable.
Swamp Attack
Weapon and upgrade choices shape wave survival
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.