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
Mobile production-chain and layout optimisation paced by timers.

Optimization · Pure Optimization
An open-ended needs-and-money system that rewards efficient scheduling.
SimCity BuildIt leans Optimization (Pure Optimization); The Sims leans Optimization (Pure Optimization).
The Sims leans a little harder on execution, though the gap is small.
SimCity BuildIt
Tapping menus has no skill floor
The Sims
Clicking menus has no physical ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
SimCity BuildIt
No adversary; trade is asynchronous
The Sims
Sims run need-driven scripts, not minds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
SimCity BuildIt
Market prices and material drops add mild randomness
The Sims
Event rolls add flavour, all quickly mapped
SimCity BuildIt leans a little harder on optimization, though the gap is small.
SimCity BuildIt
Production chains, layout and currency timing are the whole game
The Sims
Need scheduling, career grinding and money loops are solvable
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.