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
A third-person tower defense about funneling orc hordes into gleefully lethal trap corridors.
Besiege leans Optimization (Pure Optimization); Orcs Must Die! leans Optimization (Pure Optimization).
Orcs Must Die! leans a little harder on execution, though the gap is small.
Besiege
Piloting wobbly contraptions takes some hand skill
Orcs Must Die!
Active shooting supplements the traps
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
Orcs Must Die!
Orc waves follow fixed paths
Orcs Must Die! leans a little harder on variance, though the gap is small.
Besiege
Deterministic physics and fixed objectives
Orcs Must Die!
Minor wave composition randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Besiege
Machine engineering is the whole game
Orcs Must Die!
Trap placement and kill-corridor economics are the game
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.