head to head
Neither is simply harder - they are hard in different places. Kerbal Space Program demands more optimization; Mount & Blade: Warband demands more reads.

Optimization · Pure Optimization
Rocket engineering sandbox about orbital mechanics.

Optimization · Pure Optimization
Cult sandbox where you rise from mercenary to king through swordplay and logistics.
Kerbal Space Program leans Optimization (Pure Optimization); Mount & Blade: Warband 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.
Kerbal Space Program
Manual piloting, docking precision
Mount & Blade: Warband
Directional blocking with a real skill ceiling
Mount & Blade: Warband leans clearly harder on reads.
Kerbal Space Program
No adaptive opponents
Mount & Blade: Warband
Multiplayer melee involves human feint-reading
Mount & Blade: Warband leans a little harder on variance, though the gap is small.
Kerbal Space Program
Light reentry and physics variance
Mount & Blade: Warband
Emergent campaign events and lord politics
Kerbal Space Program leans clearly harder on optimization.
Kerbal Space Program
Rocket design, delta-v budget, mission planning
Mount & Blade: Warband
Trade routes, troop trees, and fief management 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.