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 · Pure Optimization
A subversive JRPG where understanding rolling HP mechanics and PSI optimization defeats its quirky scripted encounters.

Optimization · Pure Optimization
Remake of Gaiden with dual protagonists and explorable dungeons.
EarthBound leans Optimization (Pure Optimization); Fire Emblem Echoes: Shadows of Valentia leans Optimization (Pure Optimization).
EarthBound leans a little harder on execution, though the gap is small.
EarthBound
Rolling HP meter has very mild timing implication
Fire Emblem Echoes: Shadows of Valentia
Turn-based menus only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
EarthBound
All enemies scripted with fixed attack patterns
Fire Emblem Echoes: Shadows of Valentia
Scripted enemies on both routes
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
EarthBound
PSI randomness, enemy attack variety, and encounter triggers add unpredictability
Fire Emblem Echoes: Shadows of Valentia
Hit RNG plus dungeon encounters
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
EarthBound
Status effects, rolling HP strategy, and Franklin Badge usage are solvable
Fire Emblem Echoes: Shadows of Valentia
Dual-army routing and class promotions
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.