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

Optimization · Pure Optimization
Beloved fantasy turn-based strategy of heroes, castles, and stacked creature armies racing for map control.

Optimization · Pure Optimization
A grand strategy 4X where empire optimization carries you through random crises.
Heroes of Might and Magic II leans Optimization (Pure Optimization); Stellaris 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.
Heroes of Might and Magic II
Turn-based clicking only
Stellaris
Real-time pausable with no input precision.
Stellaris leans a little harder on reads, though the gap is small.
Heroes of Might and Magic II
Hotseat duels reward mind games; AI is mappable
Stellaris
AI is scripted; multiplayer adds modest adaptation.
Stellaris leans a little harder on variance, though the gap is small.
Heroes of Might and Magic II
Map exploration, morale, luck, and combat rolls
Stellaris
Galaxy gen, anomalies, and crises vary widely.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Heroes of Might and Magic II
Build orders, hero chaining, and creature math are deeply solvable
Stellaris
Empire builds, fleet comps, and economy dominate.
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.