head to head
Dirt 5vsMotorStorm: Arctic Edge
Dirt 5 leans Execution (Pure Mechanics); MotorStorm: Arctic Edge leans Execution (Pure Mechanics).
Dirt 5MotorStorm: Arctic Edge
Axis by axis
Execution7 vs 7
Even - both lean on execution about the same.
Reads2 vs 1
Dirt 5 leans harder on reads: Pack racing adds light wheel-to-wheel jockeying
Variance2 vs 3
MotorStorm: Arctic Edge leans harder on variance: Avalanches and collapsing ice inject track chaos
Optimization4 vs 4
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.

