head to head
Neither is simply harder - they are hard in different places. AI Dungeon demands more variance; Garry's Mod demands more execution.

Variance · Pure Chaos
An AI-driven text adventure testing creative prompting against unpredictable generated stories.

Reads · Light / Casual
Source-engine sandbox whose community modes range from building to social deduction.
AI Dungeon leans Variance (Pure Chaos); Garry's Mod leans Reads (Light / Casual).
Garry's Mod leans clearly harder on execution.
AI Dungeon
Typing text, no physical skill
Garry's Mod
Varies by mode; base sandbox is undemanding
Garry's Mod leans a little harder on reads, though the gap is small.
AI Dungeon
AI narrator generates, not a mind modeling you
Garry's Mod
Social deduction modes like TTT involve humans
AI Dungeon leans clearly harder on variance.
AI Dungeon
Unpredictable AI generation drives every turn
Garry's Mod
Hidden roles and player chaos in popular modes
Garry's Mod leans a little harder on optimization, though the gap is small.
AI Dungeon
Prompt phrasing slightly steers outcomes
Garry's Mod
Contraption building rewards systems knowledge
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.