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
A large-scale real-time strategy game about massive army economies in the 17th century.

Optimization · Pure Optimization
Instanced online RPG where deck-like eight-skill builds decide battles before they begin.
Cossacks 3 leans Optimization (Pure Optimization); Guild Wars leans Optimization (Pure Optimization).
Guild Wars leans a little harder on execution, though the gap is small.
Cossacks 3
unit micromanagement under real-time pressure
Guild Wars
Interrupt timing and kiting in skirmishes
Cossacks 3 leans a little harder on reads, though the gap is small.
Cossacks 3
human opponents bluff builds and attacks
Guild Wars
GvG and arena metagame against adapting humans
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Cossacks 3
minor combat outcome randomness
Guild Wars
Modest drop and spawn randomness
Cossacks 3 leans a little harder on optimization, though the gap is small.
Cossacks 3
massive army economy and tech optimization
Guild Wars
Eight-skill build construction is the game's soul
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.