head to head
Neither is simply harder - they are hard in different places. Elven Legacy demands more variance; Portal demands more execution.

Optimization · Pure Optimization
A turn-based fantasy tactics game emphasizing hex-grid battle strategy.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Elven Legacy leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Elven Legacy
no reflex demand, turn-based unit orders
Portal
Portal placement timing modest.
Elven Legacy leans a little harder on reads, though the gap is small.
Elven Legacy
AI opponents mostly scripted, minor prediction
Portal
No adversary modeling player.
Elven Legacy leans clearly harder on variance.
Elven Legacy
combat resolution dice-like randomness
Portal
Deterministic chambers; no randomness.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Elven Legacy
tactical unit positioning and hero builds
Portal
Pure puzzle-solving optimization.
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.