head to head
Neither is simply harder - they are hard in different places. Dark and Darker demands more variance; StarCraft II: Wings of Liberty demands more execution.

Reads · Grand Arena
Tests slow-melee dueling and predicting human extraction squads under loot RNG.

Execution · Grand Arena
Real-time strategy where hands, reads, and build optimization all matter at the top.
Dark and Darker leans Reads (Grand Arena); StarCraft II: Wings of Liberty leans Execution (Grand Arena).
StarCraft II: Wings of Liberty leans clearly harder on execution.
Dark and Darker
Slow melee timing, spacing and spell aim decide fights
StarCraft II: Wings of Liberty
APM, macro, micro-control under pressure
StarCraft II: Wings of Liberty leans a little harder on reads, though the gap is small.
Dark and Darker
Third-partying, baiting and outplaying human squads is central
StarCraft II: Wings of Liberty
1v1 ladder vs adaptive humans modeling you
Dark and Darker leans clearly harder on variance.
Dark and Darker
Loot rolls, spawns and circle placement shape every raid
StarCraft II: Wings of Liberty
map spawns minor; mostly known
StarCraft II: Wings of Liberty leans clearly harder on optimization.
Dark and Darker
Gear economy, class builds and dungeon routes reward grinding knowledge
StarCraft II: Wings of Liberty
build orders, economy curves heavily solved
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.