head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

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

Reads · Grand Arena
Cold-front sequel; same reads-heavy tactical RTS feel.
Command & Conquer 3: Tiberium Wars leans Optimization (Grand Arena); Company of Heroes 2 leans Reads (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer 3: Tiberium Wars
Fast micro on squads and harvesters
Company of Heroes 2
squad micro under pressure
Company of Heroes 2 leans a little harder on reads, though the gap is small.
Command & Conquer 3: Tiberium Wars
Ranked 1v1 rewards reading enemy tech paths
Company of Heroes 2
1v1 flanks and feints
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Command & Conquer 3: Tiberium Wars
Fog hides tech switches until scouted
Company of Heroes 2
true sight, fog, weather
Command & Conquer 3: Tiberium Wars leans a little harder on optimization, though the gap is small.
Command & Conquer 3: Tiberium Wars
Tight build orders and tiberium control
Company of Heroes 2
commander and build paths 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.