head to head
Neither is simply harder - they are hard in different places. Fantasy Wars demands more variance; Portal 2 demands more execution.

Optimization · Pure Optimization
Hex-based tactical battles testing unit preservation and turn-limit route planning.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.
Fantasy Wars leans Optimization (Pure Optimization); Portal 2 leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Fantasy Wars
Turn-based hex orders need no dexterity
Portal 2
Portal placement requires some precision but timing is lenient.
Fantasy Wars leans clearly harder on reads.
Fantasy Wars
Multiplayer hotseat adds light human prediction
Portal 2
No opponent; puzzles are static.
Fantasy Wars leans clearly harder on variance.
Fantasy Wars
Hit-chance rolls and fog create swing moments
Portal 2
Puzzles are deterministic with no randomness.
Portal 2 leans a little harder on optimization, though the gap is small.
Fantasy Wars
Unit upgrades, terrain and turn-limit routing reward deep calculation
Portal 2
Solving the puzzle's logic IS the entire 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.