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
Remake of Gaiden with dual protagonists and explorable dungeons.

Optimization · Systems & Chaos
Tests observational memory - spotting randomized anomalies against a memorised baseline corridor.
Fire Emblem Echoes: Shadows of Valentia leans Optimization (Pure Optimization); The Exit 8 leans Optimization (Systems & Chaos).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Echoes: Shadows of Valentia
Turn-based menus only
The Exit 8
Walking a corridor demands nothing physical
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fire Emblem Echoes: Shadows of Valentia
Scripted enemies on both routes
The Exit 8
Anomalies are drawn randomly, not adaptively
The Exit 8 leans a little harder on variance, though the gap is small.
Fire Emblem Echoes: Shadows of Valentia
Hit RNG plus dungeon encounters
The Exit 8
Which anomaly appears each loop is hidden information
Fire Emblem Echoes: Shadows of Valentia leans a little harder on optimization, though the gap is small.
Fire Emblem Echoes: Shadows of Valentia
Dual-army routing and class promotions
The Exit 8
Memorising the anomaly catalogue converges to a checklist
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.