head to head
vs
Battlefield 3vsHalo 2
Battlefield 3 leans Execution (Competitive PvP); Halo 2 leans Execution (Pure Mechanics).
Battlefield 3Halo 2
Axis by axis
Execution7 vs 8
Halo 2 leans harder on execution: BR precision and movement tricks online
Reads5 vs 5
Even - both lean on reads about the same.
Variance3 vs 2
Battlefield 3 leans harder on variance: Spawns, destruction, and vehicle drops shuffle engagements
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.