head to head
MotorStorm: RCvsSonic Adventure DX: Director's Cut
MotorStorm: RC leans Execution (Pure Mechanics); Sonic Adventure DX: Director's Cut leans Execution (Practiced Mastery).
MotorStorm: RCSonic Adventure DX: Director's Cut
Axis by axis
Execution7 vs 6
MotorStorm: RC leans harder on execution: Tight RC handling on short tracks rewards pure car control
Reads1 vs 0
MotorStorm: RC leans harder on reads: Mostly time-attack versus static ghosts and AI
Variance1 vs 1
Even - both lean on variance about the same.
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.

