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
A cinematic action adventure retelling Journey to the West in a post-apocalypse.

Optimization · Practiced Mastery
Mission-based sequel sending Luigi through five haunted mansions with the Poltergust.
Enslaved: Odyssey to the West leans Optimization (Practiced Mastery); Luigi's Mansion: Dark Moon 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.
Enslaved: Odyssey to the West
Forgiving combat and automated climbing
Luigi's Mansion: Dark Moon
Strobe timing and vacuum wrangling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Enslaved: Odyssey to the West
Mechs are scripted
Luigi's Mansion: Dark Moon
Ghosts are scripted mischief, not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Enslaved: Odyssey to the West
Encounters fully fixed
Luigi's Mansion: Dark Moon
Mission layouts are fixed
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Enslaved: Odyssey to the West
Upgrades and encounter solutions are learnable
Luigi's Mansion: Dark Moon
Gem hunting and mission rank routing
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.