head to head
vs
Mario Party 9vsReigns
Mario Party 9 leans Variance (Pure Chaos); Reigns leans Variance (Systems & Chaos).
Mario Party 9Reigns
Axis by axis
Execution3 vs 1
Mario Party 9 leans harder on execution: Minigames need only light dexterity
Reads2 vs 2
Even - both lean on reads about the same.
Variance8 vs 7
Mario Party 9 leans harder on variance: Dice rolls and event spaces dominate who wins
Optimization2 vs 5
Reigns leans harder on optimization: Learning which choice chains balance the four meters is mappable
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.