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

Optimization · Pure Optimization
A turn-based tactics game about maneuvering units to outmatch the enemy.
Clash of Clans leans Optimization (Pure Optimization); Tiny Metal: Full Metal Rumble 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
Tiny Metal: Full Metal Rumble
Issuing unit orders has no twitch demand
Tiny Metal: Full Metal Rumble leans a little harder on reads, though the gap is small.
Clash of Clans
Base layouts anticipate human attackers' habits
Tiny Metal: Full Metal Rumble
Human opponents reward predicting their advances
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
Tiny Metal: Full Metal Rumble
Some combat rolls and fog add uncertainty
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
Tiny Metal: Full Metal Rumble
Unit composition, terrain and economy decide battles
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.