head to head
Neither is simply harder - they are hard in different places. Unfortunate Spacemen demands more reads; Worms 3D demands more optimization.

Reads · Bluff & Deduction
Spacemen complete station tasks while a shapeshifting monster impersonates and eats them.

Execution · Competitive PvP
Artillery touch, human prediction and weapon economy in destructible 3D terrain.
Unfortunate Spacemen leans Reads (Bluff & Deduction); Worms 3D leans Execution (Competitive PvP).
Worms 3D leans a little harder on execution, though the gap is small.
Unfortunate Spacemen
Shooter combat matters once the monster is exposed.
Worms 3D
Judging grenade arcs and wind in 3D takes real touch
Unfortunate Spacemen leans clearly harder on reads.
Unfortunate Spacemen
The shapeshifter wins by out-modeling suspicious human crewmates.
Worms 3D
Predicting where a human hides and strikes next matters
Unfortunate Spacemen leans clearly harder on variance.
Unfortunate Spacemen
Hidden monster identity and random objectives drive uncertainty.
Worms 3D
Wind, crate drops and terrain chaos swing turns
Worms 3D leans clearly harder on optimization.
Unfortunate Spacemen
Station layouts and objective flow reward repetition modestly.
Worms 3D
Weapon economy and positioning math reward 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.