head to head
Garry's Mod asks more than VRChat, and the gap is optimization.

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

Reads · Light / Casual
A social platform that tests presence and people skills, not gameplay mastery.
Garry's Mod leans Reads (Light / Casual); VRChat leans Reads (Light / Casual).
Garry's Mod leans a little harder on execution, though the gap is small.
Garry's Mod
Varies by mode; base sandbox is undemanding
VRChat
Socialising and exploring demand no mechanical skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Garry's Mod
Social deduction modes like TTT involve humans
VRChat
Reading other humans socially, not competitively
Garry's Mod leans a little harder on variance, though the gap is small.
Garry's Mod
Hidden roles and player chaos in popular modes
VRChat
User-generated worlds surprise but aren't a skill test
Garry's Mod leans clearly harder on optimization.
Garry's Mod
Contraption building rewards systems knowledge
VRChat
No win condition to optimise toward
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.