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 post-nuclear RPG expanded in scope where tagged builds and Gifted-trait optimization dominate.

Optimization · Pure Optimization
A broken-system RPG where influence manipulation and prestige class chaining produce dominant power spikes.
Fallout 2 leans Optimization (Pure Optimization); Knights of the Old Republic II: The Sith Lords 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 2
Turn-based AP system makes twitch entirely irrelevant
Knights of the Old Republic II: The Sith Lords
Pseudo-turn-based d20 system makes twitch irrelevant throughout
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout 2
All tribal and Enclave enemies run fixed scripted combat routines
Knights of the Old Republic II: The Sith Lords
Influence system uses scripted dialogue triggers, no adaptive opponent
Fallout 2 leans a little harder on variance, though the gap is small.
Fallout 2
Hidden special encounters and timed events create significant unknown-information space
Knights of the Old Republic II: The Sith Lords
Influence thresholds and hidden stat distributions create first-play unknowns
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Fallout 2
SPECIAL and skill tagging with Gifted trait produce well-known dominant build strategies
Knights of the Old Republic II: The Sith Lords
Prestige class chaining and influence-stat transfer create near-broken optimization ceilings
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.