head to head
vs
I Am BreadvsMario Bros.
I Am Bread leans Execution (Pure Mechanics); Mario Bros. leans Execution (Pure Mechanics).
I Am BreadMario Bros.
Axis by axis
Execution8 vs 7
I Am Bread leans harder on execution: Wrestling deliberately awkward physics controls
Reads0 vs 1
Mario Bros. leans harder on reads: Versus mode adds light human interference, enemies are scripted
Variance2 vs 2
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.