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

Optimization · Pure Optimization
The original post-apocalyptic CRPG where character builds solve the wasteland.

Optimization · Pure Optimization
Hardest modern-era Fire Emblem, a sprawling multi-army tactics campaign where planning around hit RNG is everything.
Fallout leans Optimization (Pure Optimization); Fire Emblem: Radiant Dawn 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.
Fallout
Turn-based, no dexterity
Fire Emblem: Radiant Dawn
Grid menus; no physical skill.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout
No adaptive opposition
Fire Emblem: Radiant Dawn
Enemy AI follows exploitable fixed priorities.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout
To-hit rolls and random encounters
Fire Emblem: Radiant Dawn
Hit, crit, and level-up rolls threaten permadeath plans.
Fire Emblem: Radiant Dawn leans a little harder on optimization, though the gap is small.
Fallout
SPECIAL builds and quest routing are deeply solvable
Fire Emblem: Radiant Dawn
Unit deployment, BEXP routing, and map solutions dominate.
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.