head to head
Neither is simply harder - they are hard in different places. Reigns demands more optimization; Sonic Shuffle 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
A Mario Party-style Sonic board game where hidden movement cards drive the race for Precioustones.
Reigns leans Variance (Systems & Chaos); Sonic Shuffle leans Variance (Pure Chaos).
Sonic Shuffle leans clearly harder on execution.
Reigns
Swiping cards left or right has no skill dimension
Sonic Shuffle
Minigames need modest timing and reflexes
Sonic Shuffle leans a little harder on reads, though the gap is small.
Reigns
Card characters react to prior choices in semi-scripted ways
Sonic Shuffle
Some bluffing against human opponents in card duels
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Reigns
Event card ordering and hidden outcome RNG dominate play
Sonic Shuffle
Hidden movement cards and board events dominate outcomes
Reigns leans clearly harder on optimization.
Reigns
Learning which choice chains balance the four meters is mappable
Sonic Shuffle
Basic card management and route planning
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.