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

Optimization · Pure Optimization
Strategy sim about evolving a pathogen to outpace the world's cure effort.

Optimization · Pure Optimization
Mobile production-chain and layout optimisation paced by timers.
Plague Inc. leans Optimization (Pure Optimization); SimCity BuildIt leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Plague Inc.
Tapping menus only
SimCity BuildIt
Tapping menus has no skill floor
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Plague Inc.
World response is algorithmic, not adaptive to you
SimCity BuildIt
No adversary; trade is asynchronous
Plague Inc. leans a little harder on variance, though the gap is small.
Plague Inc.
Spread events and cure pace fluctuate
SimCity BuildIt
Market prices and material drops add mild randomness
Plague Inc. leans a little harder on optimization, though the gap is small.
Plague Inc.
Evolution-point timing strategies are largely solved
SimCity BuildIt
Production chains, layout and currency timing are the whole game
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.