head to head
vs
PortalvsRoll Away
Portal leans Optimization (Pure Optimization); Roll Away leans Optimization (Practiced Mastery).
PortalRoll Away
Axis by axis
Execution4 vs 5
Roll Away leans harder on execution: Careful ball control over narrow gravity-shifting ledges punishes slips
Reads0 vs 0
Even - both lean on reads about the same.
Variance0 vs 0
Even - both lean on variance about the same.
Optimization8 vs 7
Portal leans harder on optimization: Pure puzzle-solving optimization.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.