head to head
vs
Fallout 4vsFallout: New Vegas
Fallout 4 leans Optimization (Pure Optimization); Fallout: New Vegas leans Optimization (Pure Optimization).
Fallout 4Fallout: New Vegas
Axis by axis
Execution4 vs 4
Even - both lean on execution about the same.
Reads1 vs 1
Even - both lean on reads about the same.
Variance2 vs 2
Even - both lean on variance about the same.
Optimization7 vs 8
Fallout: New Vegas leans harder on optimization: Faction routing, perks, builds heavily rewarded
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.