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

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

Optimization · Pure Optimization
Fantasy 4X with strong asymmetric factions and quest paths.
Clash of Clans leans Optimization (Pure Optimization); Endless Legend 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.
Clash of Clans
Troop drop placement is forgiving
Endless Legend
turn-based
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Clash of Clans
Base layouts anticipate human attackers' habits
Endless Legend
scripted AI, limited MP
Endless Legend leans a little harder on variance, though the gap is small.
Clash of Clans
Matchmaking and unseen traps add uncertainty
Endless Legend
quest and tech rolls
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
Endless Legend
faction-specific yield optimization
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.