head to head
Assassin's Creed Rogue asks more than Grand Theft Auto V, and the gap is optimization.

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

Execution · Practiced Mastery
Sandbox crime playground spanning shooting, driving, and a persistent online economy.
Assassin's Creed Rogue leans Optimization (Practiced Mastery); Grand Theft Auto V leans Execution (Practiced Mastery).
Grand Theft Auto V leans a little harder on execution, though the gap is small.
Assassin's Creed Rogue
Forgiving parkour and counter-heavy combat ask little
Grand Theft Auto V
Driving and shooting demand decent inputs.
Grand Theft Auto V leans a little harder on reads, though the gap is small.
Assassin's Creed Rogue
Stalker assassins ambush by script, not adaptation
Grand Theft Auto V
Online PvP exists but mostly gear/positioning, not modeling.
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
Grand Theft Auto V
Some mission and lobby randomness.
Assassin's Creed Rogue leans clearly harder on optimization.
Assassin's Creed Rogue
Ship upgrades, fleet economy, and collectible routing dominate
Grand Theft Auto V
Heists, money loops, builds learnable.
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.