head to head
Marbles on Stream asks more than Goat Simulator, and the gap is variance.

Variance · Light / Casual
Deliberately broken physics sandbox about a goat causing mayhem.

Variance · Pure Chaos
Tests nothing but luck - a spectator marble race decided entirely by physics RNG.
Goat Simulator leans Variance (Light / Casual); Marbles on Stream leans Variance (Pure Chaos).
Goat Simulator leans a little harder on execution, though the gap is small.
Goat Simulator
Janky physics resist precision on purpose
Marbles on Stream
You watch a marble roll; no inputs matter
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Goat Simulator
No opposition; pure sandbox
Marbles on Stream
No opponent decisions exist to predict
Marbles on Stream leans clearly harder on variance.
Goat Simulator
Ragdoll chaos is unpredictable but stakes-free
Marbles on Stream
Physics RNG decides the entire race outcome
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Goat Simulator
Score combos exist but barely matter
Marbles on Stream
Nothing to solve beyond picking a marble skin
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.