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 direct Unova sequel with an expanded Pokedex, Pokemon World Tournament, and the toughest Gen 5 content.
Clash of Clans leans Optimization (Pure Optimization); Pokemon Black Version 2 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 Black Version 2
Turn-based; nothing for the hands
Clash of Clans leans a little harder on reads, though the gap is small.
Clash of Clans
Base layouts anticipate human attackers' habits
Pokemon Black Version 2
Campaign foes are scripted; competitive 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 Black Version 2
Encounter and catch RNG plus hidden IVs
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 Black Version 2
Deep team building, EV training, and matchup mastery
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.