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

Execution · Practiced Mastery
A movie tie-in testing combo timing against scripted duels.
Assassin's Creed III leans Optimization (Practiced Mastery); Star Wars: Episode III - Revenge of the Sith leans Execution (Practiced Mastery).
Star Wars: Episode III - Revenge of the Sith leans a little harder on execution, though the gap is small.
Assassin's Creed III
Frontier traversal and counter combat stay forgiving
Star Wars: Episode III - Revenge of the Sith
Lightsaber combos and blocks need modest timing
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed III
Multiplayer mode involved human deception
Star Wars: Episode III - Revenge of the Sith
Versus duel mode adds light human prediction
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
Star Wars: Episode III - Revenge of the Sith
Encounters are fixed movie-scripted setpieces
Assassin's Creed III leans a little harder on optimization, though the gap is small.
Assassin's Creed III
Homestead economy and naval upgrades
Star Wars: Episode III - Revenge of the Sith
Combo unlocks and boss patterns are quickly mapped
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.