head to head
vs
Fallout 4vsMass Effect 3
Fallout 4 leans Optimization (Pure Optimization); Mass Effect 3 leans Optimization (Practiced Mastery).
Fallout 4Mass Effect 3
Axis by axis
Execution4 vs 5
Mass Effect 3 leans harder on execution: More combat focus, biotic combos demand timing
Reads1 vs 1
Even - both lean on reads about the same.
Variance2 vs 1
Fallout 4 leans harder on variance: Loot and legendary rolls
Optimization7 vs 7
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.