head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is reads, and it is a single point.

Optimization · Pure Optimization
Building a team and exploiting type-matchup math against scripted trainers.

Optimization · Pure Optimization
Methodically mapping a fixed labyrinth while managing levelling and gear economy.
Pokémon LeafGreen Version leans Optimization (Pure Optimization); Shining in the Darkness 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 LeafGreen Version
Menu-driven turn battles demand no physical skill
Shining in the Darkness
Menu-driven turn battles need no dexterity
Pokémon LeafGreen Version leans a little harder on reads, though the gap is small.
Pokémon LeafGreen Version
Trainers are scripted; link battles are a side mode
Shining in the Darkness
Monsters follow fixed behaviour tables
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon LeafGreen Version
Wild encounters, catch rolls and crits add mappable RNG
Shining in the Darkness
Maze layout and random encounters are unknown until mapped
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Pokémon LeafGreen Version
Type matchups and team building are the solvable core
Shining in the Darkness
Mapping the labyrinth and grinding gear efficiently is the game
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.