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
Base-building strategy game about optimizing upgrade economy and raid compositions.

Optimization · Pure Optimization
The expanded Alola adventure with an altered story, Ultra Wormhole hunting, and Rainbow Rocket.
Clash of Clans leans Optimization (Pure Optimization); Pokemon Ultra Sun leans Optimization (Pure Optimization).
Clash of Clans leans a little harder on execution, though the gap is small.
Clash of Clans
Troop drop placement is forgiving
Pokemon Ultra Sun
Menu battles, zero dexterity
Clash of Clans leans a little harder on reads, though the gap is small.
Clash of Clans
Base layouts anticipate human attackers' habits
Pokemon Ultra Sun
Scripted bosses and trainers; PvP optional
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Clash of Clans
Matchmaking and unseen traps add uncertainty
Pokemon Ultra Sun
Wormhole legendaries and encounter RNG
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Clash of Clans
Army comps, upgrade paths, and attack routing
Pokemon Ultra Sun
Expanded Dex and tougher fights reward team planning
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.