head to head
vs
The Need for SpeedvsWii Sports
The Need for Speed leans Execution (Pure Mechanics); Wii Sports leans Execution (Pure Mechanics).
The Need for SpeedWii Sports
Axis by axis
Execution7 vs 6
The Need for Speed leans harder on execution: Holding racing lines at speed through traffic is the test
Reads1 vs 2
Wii Sports leans harder on reads: Casual local opponents add light mind games
Variance2 vs 2
Even - both lean on variance about the same.
Optimization3 vs 3
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.