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

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

Optimization · Pure Optimization
A turn-based JRPG won through formation tactics, rune builds, and exhaustive recruit hunting.
Portal 2 leans Optimization (Pure Optimization); Suikoden V leans Optimization (Pure Optimization).
Portal 2 leans clearly harder on execution.
Portal 2
Portal placement requires some precision but timing is lenient.
Suikoden V
Menu-driven turns; inputs trivial.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Portal 2
No opponent; puzzles are static.
Suikoden V
Fixed enemy scripts throughout.
Suikoden V leans clearly harder on variance.
Portal 2
Puzzles are deterministic with no randomness.
Suikoden V
Hidden recruitment triggers and drop rolls.
Portal 2 leans a little harder on optimization, though the gap is small.
Portal 2
Solving the puzzle's logic IS the entire game.
Suikoden V
Party formations, runes, and recruitment routing solve it.
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.