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

Optimization · Pure Optimization
A Greek-myth loot ARPG won in the build screen, not the battlefield.
Fallout leans Optimization (Pure Optimization); Titan Quest leans Optimization (Pure Optimization).
Titan Quest leans a little harder on execution, though the gap is small.
Fallout
Turn-based, no dexterity
Titan Quest
Click-to-attack combat needs little 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
Titan Quest
Mythological monsters follow fixed behaviors
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
Titan Quest
Loot drops gate builds behind RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout
SPECIAL builds and quest routing are deeply solvable
Titan Quest
Mastery combinations and gear math dominate outcomes
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.