head to head
Armored Core VI: Fires of RubiconvsMetal Gear Solid 2: Sons of Liberty
Armored Core VI: Fires of Rubicon leans Execution (Practiced Mastery); Metal Gear Solid 2: Sons of Liberty leans Optimization (Practiced Mastery).
Armored Core VI: Fires of RubiconMetal Gear Solid 2: Sons of Liberty
Axis by axis
Execution7 vs 6
Armored Core VI: Fires of Rubicon leans harder on execution: Boss fights demand sharp dodges and stagger timing
Reads1 vs 1
Even - both lean on reads about the same.
Variance1 vs 2
Metal Gear Solid 2: Sons of Liberty leans harder on variance: Alert timers and item pickups create some hidden-state tension
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.

