head to head
vs
Portal 2vsStretchmo
Portal 2 leans Optimization (Pure Optimization); Stretchmo leans Optimization (Pure Optimization).
Portal 2Stretchmo
Axis by axis
Execution3 vs 2
Portal 2 leans harder on execution: Portal placement requires some precision but timing is lenient.
Reads0 vs 0
Even - both lean on reads about the same.
Variance0 vs 1
Stretchmo leans harder on variance: Puzzles are fixed with deterministic solutions
Optimization9 vs 9
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.