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 castle-building strategy game where economic optimization and defense planning is the whole test.
Mindustry leans Optimization (Pure Optimization); Stronghold leans Optimization (Pure Optimization).
Mindustry leans a little harder on execution, though the gap is small.
Mindustry
some tower placement under pressure
Stronghold
minimal, mostly clicking and management
Stronghold leans a little harder on reads, though the gap is small.
Mindustry
scripted enemy waves
Stronghold
AI opponents are scripted, minor prediction
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
Stronghold
minor resource and raid randomness
Mindustry leans a little harder on optimization, though the gap is small.
Mindustry
factory belts and logistics chains
Stronghold
economy and castle-building near-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.