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
Open-world Pokémon where you tackle gyms and titans in any order.

Optimization · Pure Optimization
Character-driven turn-based JRPG with a deeply customizable orbment magic system.
Pokémon Scarlet leans Optimization (Pure Optimization); The Legend of Heroes: Trails in the Sky 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 Scarlet
Open-world traversal, battles stay menu-based
The Legend of Heroes: Trails in the Sky
Turn-based menus only
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Scarlet
NPC trainers never adapt
The Legend of Heroes: Trails in the Sky
Scripted encounters, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Scarlet
Open-world spawns and tera raids
The Legend of Heroes: Trails in the Sky
Minor turn-order and drop randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon Scarlet
Terastallize typing adds a planning layer
The Legend of Heroes: Trails in the Sky
Orbment quartz setups and turn-bonus manipulation
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.