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
Combat-focused Infinity Engine RPG built on D&D party optimization.

Optimization · Pure Optimization
Mastering faithful D&D 3.5 rules and party builds against dice-roll swing.
Icewind Dale leans Optimization (Pure Optimization); The Temple of Elemental Evil 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
Pausable real-time needs little dexterity
The Temple of Elemental Evil
Turn-based clicks - hands never matter
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Icewind Dale
Enemies follow fixed AI scripts
The Temple of Elemental Evil
Encounters run on D&D scripts, not adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Icewind Dale
D&D dice rolls and random loot tables
The Temple of Elemental Evil
Dice rolls swing fights until builds overpower them
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Icewind Dale
Party builds, spell prep, and encounter knowledge
The Temple of Elemental Evil
Mastering 3.5e rules, builds and positioning is the game
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.