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 · Practiced Mastery
A Revolutionary War entry mixing frontier stealth, naval battles, and homestead building.

Optimization · Practiced Mastery
A darkly comic action game where you herd colour-coded minion hordes as an evil overlord.
Assassin's Creed III leans Optimization (Practiced Mastery); Overlord leans Optimization (Practiced Mastery).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed III
Frontier traversal and counter combat stay forgiving
Overlord
Sweeping minion hordes takes modest dexterity
Assassin's Creed III leans a little harder on reads, though the gap is small.
Assassin's Creed III
Multiplayer mode involved human deception
Overlord
Scripted heroes and creatures
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed III
Fixed story missions
Overlord
Fixed level design
Overlord leans a little harder on optimization, though the gap is small.
Assassin's Creed III
Homestead economy and naval upgrades
Overlord
Minion type usage and upgrade economy reward 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.