head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Optimization · Pure Optimization
An open-ended needs-and-money system that rewards efficient scheduling.

Optimization · Pure Optimization
Coordinating collectivist town logistics around unpredictable resource islands.
The Sims leans Optimization (Pure Optimization); The Tomorrow Children leans Optimization (Pure Optimization).
The Tomorrow Children leans a little harder on execution, though the gap is small.
The Sims
Clicking menus has no physical ceiling
The Tomorrow Children
Digging and hauling are deliberate, not twitchy
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Sims
Sims run need-driven scripts, not minds
The Tomorrow Children
Izverg monsters attack on scripts, not adaptation
The Tomorrow Children leans a little harder on variance, though the gap is small.
The Sims
Event rolls add flavour, all quickly mapped
The Tomorrow Children
Island resources appear unpredictably across the Void
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Sims
Need scheduling, career grinding and money loops are solvable
The Tomorrow Children
Town logistics and labour efficiency are the real system
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.