head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
A 3rd Edition ruleset combat puzzle where multi-classing and feat selection unlock dominant strategies.

Optimization · Pure Optimization
A broken-system RPG where influence manipulation and prestige class chaining produce dominant power spikes.
Icewind Dale II 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.
Icewind Dale II
Real-time-with-pause negates twitch requirements
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.
Icewind Dale II
Scripted enemy routines offer nothing to read or predict adaptively
Knights of the Old Republic II: The Sith Lords
Influence system uses scripted dialogue triggers, no adaptive opponent
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Icewind Dale II
3E feat combinations and hidden enemy resistances create unknown-information layers
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.
Icewind Dale II
3rd Edition feat optimization and multi-class architecture dominate success
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.