head to head
Neither is simply harder - they are hard in different places. Reigns demands more optimization; Super Mario Party Jamboree demands more execution.

Variance · Systems & Chaos
A narrative card game where balancing four meters under random event draws is more luck-management than strategy.

Variance · Pure Chaos
The biggest modern Mario Party, where Jamboree Buddies and dice still outvote skill.
Reigns leans Variance (Systems & Chaos); Super Mario Party Jamboree leans Variance (Pure Chaos).
Super Mario Party Jamboree leans clearly harder on execution.
Reigns
Swiping cards left or right has no skill dimension
Super Mario Party Jamboree
Big minigame roster with short reflex bursts.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Reigns
Card characters react to prior choices in semi-scripted ways
Super Mario Party Jamboree
Buddy steals and item plays target rivals.
Super Mario Party Jamboree leans a little harder on variance, though the gap is small.
Reigns
Event card ordering and hidden outcome RNG dominate play
Super Mario Party Jamboree
Dice, buddies and bonus stars rule outcomes.
Reigns leans clearly harder on optimization.
Reigns
Learning which choice chains balance the four meters is mappable
Super Mario Party Jamboree
Buddy and route planning add light strategy.
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.