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
Physics sandbox about engineering medieval siege machines that usually explode beautifully.

Optimization · Pure Optimization
The genre-defining cartoon tower defense with crunchy upgrades and fixed waves begging for perfect solutions.
Besiege leans Optimization (Pure Optimization); Kingdom Rush leans Optimization (Pure Optimization).
Besiege leans a little harder on execution, though the gap is small.
Besiege
Piloting wobbly contraptions takes some hand skill
Kingdom Rush
Light micro of hero and rally points
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Besiege
Static castles and scripted defenders
Kingdom Rush
Wave compositions are fixed and previewable
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Besiege
Deterministic physics and fixed objectives
Kingdom Rush
Almost fully deterministic waves
Kingdom Rush leans a little harder on optimization, though the gap is small.
Besiege
Machine engineering is the whole game
Kingdom Rush
Tower placement and upgrade routes 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.