head to head
Need for Speed: RivalsvsRunbow
Need for Speed: Rivals leans Execution (Pure Mechanics); Runbow leans Execution (Pure Mechanics).
Need for Speed: RivalsRunbow
Axis by axis
Execution7 vs 7
Even - both lean on execution about the same.
Reads2 vs 3
Runbow leans harder on reads: Light jostling with human racers, but little deep prediction
Variance3 vs 4
Runbow leans harder on variance: Colour swaps and party chaos randomise each race
Optimization4 vs 2
Need for Speed: Rivals leans harder on optimization: Risk-versus-bank speedpoint economy
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.

