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
A modern arcade dungeon crawler where surviving the horde comes down to crisp dodging and aim.

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Gauntlet: Slayer Edition leans Execution (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Gauntlet: Slayer Edition leans a little harder on execution, though the gap is small.
Gauntlet: Slayer Edition
Dodging hordes and aiming skill shots is the test.
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Gauntlet: Slayer Edition
Light food-stealing mindgames between co-op partners only.
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
Gauntlet: Slayer Edition leans a little harder on variance, though the gap is small.
Gauntlet: Slayer Edition
Spawner placement and pickups vary modestly.
Grand Theft Auto V
Some mission and lobby randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Gauntlet: Slayer Edition
Relic and class choices give a small solvable edge.
Grand Theft Auto V
Heists, money loops, builds 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.