head to head
The Jackbox Survey Scramble asks more than Garry's Mod, and the gap is variance.

Reads · Light / Casual
Source-engine sandbox whose community modes range from building to social deduction.

Variance · Bluff & Deduction
A party game testing guesses about how a crowd answered survey questions.
Garry's Mod leans Reads (Light / Casual); The Jackbox Survey Scramble leans Variance (Bluff & Deduction).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Garry's Mod
Varies by mode; base sandbox is undemanding
The Jackbox Survey Scramble
Quick answer entry, minimal dexterity
The Jackbox Survey Scramble leans a little harder on reads, though the gap is small.
Garry's Mod
Social deduction modes like TTT involve humans
The Jackbox Survey Scramble
Guessing what the crowd answered involves modelling people
The Jackbox Survey Scramble leans clearly harder on variance.
Garry's Mod
Hidden roles and player chaos in popular modes
The Jackbox Survey Scramble
Hidden survey results drive the guessing each round
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Garry's Mod
Contraption building rewards systems knowledge
The Jackbox Survey Scramble
Knowing common-answer patterns gives a small edge
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.