head to head
League of Legends asks more than StarCraft, and the gap is reads.

Reads · Grand Arena
A team MOBA where map control and adaptive duels decide objectives.

Optimization · Grand Arena
A real-time strategy classic where perfected build orders and mechanical speed decide most matches.
League of Legends leans Reads (Grand Arena); StarCraft leans Optimization (Grand Arena).
StarCraft leans a little harder on execution, though the gap is small.
League of Legends
Mechanics matter but not aimbot-decisive.
StarCraft
APM and micro control ceiling is huge
League of Legends leans clearly harder on reads.
League of Legends
Lane and jungle constantly mind-game opponents.
StarCraft
scouting and predicting human opponent builds
League of Legends leans clearly harder on variance.
League of Legends
Champion select and minor RNG only.
StarCraft
minimal hidden info beyond fog of war
StarCraft leans a little harder on optimization, though the gap is small.
League of Legends
Itemization, wave management, and macro are solvable.
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.