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

Optimization · Pure Optimization
A base-layout and attack-planning puzzle against static player defenses.

Optimization · Pure Optimization
An Alolan island-trial reinvention of the Pokemon formula that swaps gyms for totem battles.
Boom Beach leans Optimization (Pure Optimization); Pokemon Sun leans Optimization (Pure Optimization).
Boom Beach leans a little harder on execution, though the gap is small.
Boom Beach
Tapping troop deployments takes no dexterity
Pokemon Sun
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.
Boom Beach
Attacks hit static bases - defenders aren't present to adapt
Pokemon Sun
Totem battles are scripted, not adaptive
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Boom Beach
Scouting reveals most info; matchmaking adds some spread
Pokemon Sun
SOS calls, encounters, and catch rolls add luck
Pokemon Sun leans a little harder on optimization, though the gap is small.
Boom Beach
Base layouts, troop compositions and timing are the solvable core
Pokemon Sun
Trial puzzles and team matchups carry 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.