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
Factory-meets-tower-defense; belts feed your defenses.

Optimization · Pure Optimization
A park management puzzle where understanding the guest happiness formula lets you solve each scenario optimally.
Mindustry leans Optimization (Pure Optimization); RollerCoaster Tycoon 2 leans Optimization (Pure Optimization).
Mindustry leans a little harder on execution, though the gap is small.
Mindustry
some tower placement under pressure
RollerCoaster Tycoon 2
Track building is grid-based with modest placement precision demands
Mindustry leans a little harder on reads, though the gap is small.
Mindustry
scripted enemy waves
RollerCoaster Tycoon 2
Guest behaviour follows fixed preference scripts
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mindustry
map layout variation
RollerCoaster Tycoon 2
Very little randomness once ride stats are understood
Mindustry leans a little harder on optimization, though the gap is small.
Mindustry
factory belts and logistics chains
RollerCoaster Tycoon 2
Pricing, ride stats, and park layout are near-perfectly 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.