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

Variance · Pure Chaos
Tests nothing but luck - a spectator marble race decided entirely by physics RNG.

Variance · Pure Chaos
A one-shot moral experiment built on hidden information about previous players.
Marbles on Stream leans Variance (Pure Chaos); Moirai leans Variance (Pure Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Marbles on Stream
You watch a marble roll; no inputs matter
Moirai
Walking and one dialogue prompt
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Marbles on Stream
No opponent decisions exist to predict
Moirai
You judge a stranger's typed words once - asynchronous, not adaptive play
Marbles on Stream leans clearly harder on variance.
Marbles on Stream
Physics RNG decides the entire race outcome
Moirai
The twist rests entirely on hidden information about prior players
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Marbles on Stream
Nothing to solve beyond picking a marble skin
Moirai
Nothing to solve; the experience is single-use
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.