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

Optimization · Practiced Mastery
An open-world stealth-action game where a turncoat assassin hunts his old brotherhood across the North Atlantic.

Optimization · Practiced Mastery
A long Viking RPG carried by exploration and gear progression.
Assassin's Creed Rogue leans Optimization (Practiced Mastery); Assassin's Creed Valhalla 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 Rogue
Forgiving parkour and counter-heavy combat ask little
Assassin's Creed Valhalla
Combat timing matters but forgiving.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Rogue
Stalker assassins ambush by script, not adaptation
Assassin's Creed Valhalla
Enemies scripted and predictable.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Assassin's Creed Rogue
Some naval weather and patrol noise
Assassin's Creed Valhalla
Loot rolls and raid encounters vary mildly.
Assassin's Creed Rogue leans a little harder on optimization, though the gap is small.
Assassin's Creed Rogue
Ship upgrades, fleet economy, and collectible routing dominate
Assassin's Creed Valhalla
Skill tree, gear, raid routing solvable.
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.