head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Practiced Mastery
Gothic action adventure built on shifting between material and spectral realms to solve puzzles.

Optimization · Practiced Mastery
A stealth-action game where planning routes past scripted guards is the deep skill.
Legacy of Kain: Soul Reaver leans Optimization (Practiced Mastery); Metal Gear Solid 2: Substance leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Legacy of Kain: Soul Reaver
Combat and platforming are deliberate, moderately demanding
Metal Gear Solid 2: Substance
stealth timing and aim matter
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Legacy of Kain: Soul Reaver
Enemies and bosses fully scripted
Metal Gear Solid 2: Substance
guards are scripted, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Legacy of Kain: Soul Reaver
World fixed once explored
Metal Gear Solid 2: Substance
minor patrol randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Legacy of Kain: Soul Reaver
Plane-shifting puzzles and route knowledge drive progress
Metal Gear Solid 2: Substance
stealth routes and gadgets solvable
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.