head to head
Neither is simply harder - they are hard in different places. Comedy Night demands more reads; Garry's Mod demands more optimization.

Reads · Bluff & Deduction
A social game where you perform live stand-up to a real human audience.

Reads · Light / Casual
Source-engine sandbox whose community modes range from building to social deduction.
Comedy Night leans Reads (Bluff & Deduction); Garry's Mod leans Reads (Light / Casual).
Garry's Mod leans a little harder on execution, though the gap is small.
Comedy Night
Speaking into a mic, no mechanical skill
Garry's Mod
Varies by mode; base sandbox is undemanding
Comedy Night leans clearly harder on reads.
Comedy Night
Live human audience reactions you must read and adapt to
Garry's Mod
Social deduction modes like TTT involve humans
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Comedy Night
Unpredictable crowd mood adds chaos each performance
Garry's Mod
Hidden roles and player chaos in popular modes
Garry's Mod leans clearly harder on optimization.
Comedy Night
No systems to solve beyond social timing
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.