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

Optimization · Pure Optimization
A sci-fi mystery that splits across thirteen protagonists' stories, backed by light real-time strategy battles.

Optimization · Pure Optimization
A story-driven survival adventure alone on a hostile alien planet.
13 Sentinels: Aegis Rim leans Optimization (Pure Optimization); The Solus Project 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.
13 Sentinels: Aegis Rim
Real-time strategy battles have light unit-control inputs
The Solus Project
Exploration platforming with mild precision needs
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
13 Sentinels: Aegis Rim
Kaiju wave patterns are scripted per stage
The Solus Project
No adaptive entities, only environment
The Solus Project leans a little harder on variance, though the gap is small.
13 Sentinels: Aegis Rim
Hidden story order and mystery connections obscure the full picture
The Solus Project
Alien caves hidden until explored, single playthrough mostly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
13 Sentinels: Aegis Rim
Optimising battle chip builds and unlocking all story segments is the mechanical layer
The Solus Project
Managing temperature, hunger, and route planning drives survival
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.