head to head
Neither is simply harder - they are hard in different places. Mortal Kombat 11 demands more reads; StarCraft demands more optimization.

Reads · Grand Arena
A controlled-pace fighter where resource management and opponent modelling outweigh raw execution pressure.

Optimization · Grand Arena
A real-time strategy classic where perfected build orders and mechanical speed decide most matches.
Mortal Kombat 11 leans Reads (Grand Arena); StarCraft leans Optimization (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat 11
Kustom variation execution is demanding but more accessible than MKX
StarCraft
APM and micro control ceiling is huge
Mortal Kombat 11 leans clearly harder on reads.
Mortal Kombat 11
Fatal Blow timing reads and opponent tendency tracking are constant
StarCraft
scouting and predicting human opponent builds
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat 11
No RNG; all mechanics are visible
StarCraft
minimal hidden info beyond fog of war
StarCraft leans clearly harder on optimization.
Mortal Kombat 11
Fatal Blow baiting, Kustom build selection, and frame data extensively studied
StarCraft
build orders 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.