head to head
Neither is simply harder - they are hard in different places. Portal demands more execution; The Legend of Heroes: Trails of Cold Steel II demands more variance.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.

Optimization · Pure Optimization
A narrative-heavy turn-based RPG deepening Cold Steel's orbment and Link optimisation with Brave Order resource management.
Portal leans Optimization (Pure Optimization); The Legend of Heroes: Trails of Cold Steel II leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Portal
Portal placement timing modest.
The Legend of Heroes: Trails of Cold Steel II
Turn-based combat; no action timing required
The Legend of Heroes: Trails of Cold Steel II leans a little harder on reads, though the gap is small.
Portal
No adversary modeling player.
The Legend of Heroes: Trails of Cold Steel II
Scripted enemy AI throughout; no adaptive opponent
The Legend of Heroes: Trails of Cold Steel II leans clearly harder on variance.
Portal
Deterministic chambers; no randomness.
The Legend of Heroes: Trails of Cold Steel II
Quartz recipe unlocks and drop rates add light RNG
The Legend of Heroes: Trails of Cold Steel II leans a little harder on optimization, though the gap is small.
Portal
Pure puzzle-solving optimization.
The Legend of Heroes: Trails of Cold Steel II
Turn-order stacking, brave order usage, and ARCUS builds reward deep planning
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.