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 cinematic open-world western leaning on shooting feel and atmosphere.
Assassin's Creed III leans Optimization (Practiced Mastery); Red Dead Redemption 2 leans Execution (Practiced Mastery).
Red Dead Redemption 2 leans a little harder on execution, though the gap is small.
Assassin's Creed III
Frontier traversal and counter combat stay forgiving
Red Dead Redemption 2
Gunplay and Dead Eye reward aim and timing.
Assassin's Creed III leans a little harder on reads, though the gap is small.
Assassin's Creed III
Multiplayer mode involved human deception
Red Dead Redemption 2
Enemies use scripted AI patterns, not adaptation.
Red Dead Redemption 2 leans a little harder on variance, though the gap is small.
Assassin's Creed III
Fixed story missions
Red Dead Redemption 2
Some hunting and weather randomness, lightly hidden.
Assassin's Creed III leans a little harder on optimization, though the gap is small.
Assassin's Creed III
Homestead economy and naval upgrades
Red Dead Redemption 2
Loadouts and routes solvable but loose.
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.