head to head
SpellForce 3 asks more than Portal 2, and the gap is variance.

Optimization · Pure Optimization
A first-person puzzle game where seeing the solution is the whole skill.

Optimization · Pure Optimization
Hybrid game fusing party-based RPG questing with full RTS base building and sector economies.
Portal 2 leans Optimization (Pure Optimization); SpellForce 3 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.
Portal 2
Portal placement requires some precision but timing is lenient.
SpellForce 3
RTS base control plus hero micro at moderate pace
SpellForce 3 leans clearly harder on reads.
Portal 2
No opponent; puzzles are static.
SpellForce 3
Skirmish PvP exists but is a small scene
SpellForce 3 leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
SpellForce 3
Loot drops and map events in RPG sections
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
SpellForce 3
Hero builds, sector economy, and army composition dominate
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.