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

Optimization · Pure Optimization
Action-leaning Pokémon spinoff about catching in real time across ancient Hisui.

Optimization · Pure Optimization
Touch-controlled DS Zelda centered on re-running a timed stealth dungeon ever faster.
Pokémon Legends: Arceus leans Optimization (Pure Optimization); The Legend of Zelda: Phantom Hourglass 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.
Pokémon Legends: Arceus
Real-time dodging, sneaking, and aimed throws
The Legend of Zelda: Phantom Hourglass
Stylus controls are simple and forgiving
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Legends: Arceus
Wild and boss behavior is scripted
The Legend of Zelda: Phantom Hourglass
Phantoms patrol fixed routes
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Legends: Arceus
Spawn tables and outbreak randomness
The Legend of Zelda: Phantom Hourglass
Sea exploration unknowns first run
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Legends: Arceus
Research tasks and agile-strong style choices reward planning
The Legend of Zelda: Phantom Hourglass
Temple of the Ocean King rewards optimized repeat 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.