head to head
vs
Assassin's Creed BrotherhoodvsBatman: Arkham City
Assassin's Creed Brotherhood leans Optimization (Practiced Mastery); Batman: Arkham City leans Execution (Practiced Mastery).
Assassin's Creed BrotherhoodBatman: Arkham City
Axis by axis
Execution4 vs 5
Batman: Arkham City leans harder on execution: Combo chains and counters need timing.
Reads2 vs 1
Assassin's Creed Brotherhood leans harder on reads: Hide-and-hunt multiplayer ran on human mind-games
Variance1 vs 1
Even - both lean on variance about the same.
Optimization5 vs 5
Even - both lean on optimization about the same.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.