head to head
Command & Conquer 3: Tiberium Wars asks more than StarCraft, and the gap is variance.

Optimization · Grand Arena
Fast tiberium-economy RTS with a once-thriving competitive 1v1 scene.

Optimization · Grand Arena
A real-time strategy classic where perfected build orders and mechanical speed decide most matches.
Command & Conquer 3: Tiberium Wars leans Optimization (Grand Arena); StarCraft leans Optimization (Grand Arena).
StarCraft leans a little harder on execution, though the gap is small.
Command & Conquer 3: Tiberium Wars
Fast micro on squads and harvesters
StarCraft
APM and micro control ceiling is huge
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer 3: Tiberium Wars
Ranked 1v1 rewards reading enemy tech paths
StarCraft
scouting and predicting human opponent builds
Command & Conquer 3: Tiberium Wars leans clearly harder on variance.
Command & Conquer 3: Tiberium Wars
Fog hides tech switches until scouted
StarCraft
minimal hidden info beyond fog of war
StarCraft leans a little harder on optimization, though the gap is small.
Command & Conquer 3: Tiberium Wars
Tight build orders and tiberium control
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.