head to head
Neither is simply harder - they are hard in different places. Front Mission 1st: Remake demands more variance; Portal demands more execution.

Optimization · Pure Optimization
Engineering optimal Wanzer configurations and skill allocations to dominate scripted mech skirmishes.

Optimization · Pure Optimization
The portal-gun puzzle game whose solutions are everything.
Front Mission 1st: Remake leans Optimization (Pure Optimization); Portal leans Optimization (Pure Optimization).
Portal leans clearly harder on execution.
Front Mission 1st: Remake
Turn-based; no twitch; Wanzer part targeting is planning-based
Portal
Portal placement timing modest.
Front Mission 1st: Remake leans a little harder on reads, though the gap is small.
Front Mission 1st: Remake
Enemy AI is scripted per mission type
Portal
No adversary modeling player.
Front Mission 1st: Remake leans clearly harder on variance.
Front Mission 1st: Remake
Hit rates and shield proc randomness create meaningful combat variance
Portal
Deterministic chambers; no randomness.
Front Mission 1st: Remake leans a little harder on optimization, though the gap is small.
Front Mission 1st: Remake
Wanzer part builds, weapon loadouts, and pilot skill allocation are the game
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.