head to head
Neither is simply harder - they are hard in different places. Gauntlet: Slayer Edition demands more execution; Grand Theft Auto: San Andreas demands more optimization.

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

Optimization · Practiced Mastery
A sprawling open-world crime epic with RPG-style character stats across a whole state.
Gauntlet: Slayer Edition leans Execution (Practiced Mastery); Grand Theft Auto: San Andreas leans Optimization (Practiced Mastery).
Gauntlet: Slayer Edition leans clearly harder on execution.
Gauntlet: Slayer Edition
Dodging hordes and aiming skill shots is the test.
Grand Theft Auto: San Andreas
Flying school and drive-bys need decent hands
Gauntlet: Slayer Edition 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: San Andreas
Gang AI is scripted, never adaptive
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: San Andreas
Territory wars and traffic add light randomness
Grand Theft Auto: San Andreas leans clearly harder on optimization.
Gauntlet: Slayer Edition
Relic and class choices give a small solvable edge.
Grand Theft Auto: San Andreas
Stats, gym, weapon skill, and routes reward systematic play
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.