head to head
Neither is simply harder - they are hard in different places. Mario Party demands more execution; The Jackbox Survey Scramble demands more reads.

Variance · Pure Chaos
The original board-game party romp where dice and Chance Time happily overrule whoever played best.

Variance · Bluff & Deduction
A party game testing guesses about how a crowd answered survey questions.
Mario Party leans Variance (Pure Chaos); The Jackbox Survey Scramble leans Variance (Bluff & Deduction).
Mario Party leans clearly harder on execution.
Mario Party
Stick-rotating and button minigames test hands briefly.
The Jackbox Survey Scramble
Quick answer entry, minimal dexterity
The Jackbox Survey Scramble leans clearly harder on reads.
Mario Party
Mild rivalry calls in versus minigames.
The Jackbox Survey Scramble
Guessing what the crowd answered involves modelling people
Mario Party leans clearly harder on variance.
Mario Party
Dice rolls and chance time decide most boards.
The Jackbox Survey Scramble
Hidden survey results drive the guessing each round
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mario Party
Star routing gives a thin strategic layer.
The Jackbox Survey Scramble
Knowing common-answer patterns gives a small edge
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.