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

Optimization · Mind & Math
A sloppy RTS still testing build orders and economy ahead of micro.

Optimization · Pure Optimization
Large-scale RTS famous for strategic zoom, thousand-unit armies, and a streaming mass-energy economy.
Empire Earth III leans Optimization (Mind & Math); Supreme Commander leans Optimization (Pure Optimization).
Supreme Commander leans a little harder on execution, though the gap is small.
Empire Earth III
Macro speed matters though far less than in tighter RTS peers
Supreme Commander
Massive APM demands across strategic-zoom battlefields
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Empire Earth III
Human opponents' timing attacks must be scouted and predicted
Supreme Commander
PvP hinges on scouting and countering opponent commitments
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Empire Earth III
Map starts and AI behaviour hold mild unknowns
Supreme Commander
Deterministic engine; only unscouted intel
Supreme Commander leans a little harder on optimization, though the gap is small.
Empire Earth III
Epoch timing and economy builds dominate outcomes
Supreme Commander
Streaming economy and build-order efficiency are the backbone
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.