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 · Mind & Math
An economy-scaling war of build orders, scouting and multi-planet attention.

Optimization · Pure Optimization
Large-scale RTS famous for strategic zoom, thousand-unit armies, and a streaming mass-energy economy.
Planetary Annihilation leans Optimization (Mind & Math); Supreme Commander leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Planetary Annihilation
Multi-planet macro demands relentless APM and attention splitting
Supreme Commander
Massive APM demands across strategic-zoom battlefields
Planetary Annihilation leans a little harder on reads, though the gap is small.
Planetary Annihilation
Scouting and out-guessing a human's expansion plan matters constantly
Supreme Commander
PvP hinges on scouting and countering opponent commitments
Planetary Annihilation leans a little harder on variance, though the gap is small.
Planetary Annihilation
Procedural systems and fog hide early information
Supreme Commander
Deterministic engine; only unscouted intel
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Planetary Annihilation
Economy scaling and build orders dominate - near-solvable openings
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.