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
A futuristic city-builder where eco and industrial factions race to settle a flooded Earth.

Optimization · Pure Optimization
A deep tower defense about popping waves of balloons with monkey towers.
Anno 2070 leans Optimization (Pure Optimization); Bloons TD 6 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.
Anno 2070
Building and routing, no reflexes
Bloons TD 6
Placement clicks only; no dexterity ceiling
Anno 2070 leans a little harder on reads, though the gap is small.
Anno 2070
Faction AI is scripted
Bloons TD 6
Bloon waves are fixed and known
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Anno 2070
Map generation varies resources slightly
Bloons TD 6
Wave order is deterministic; tiny targeting randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Anno 2070
Eco-versus-industry chains reward exact balancing
Bloons TD 6
Tower placement, upgrades, and economy are 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.