head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

Execution · Competitive PvP
Artillery touch, human prediction and weapon economy in destructible 3D terrain.

Execution · Competitive PvP
Artillery aim and turn planning against human opponents on destructible terrain.
Worms 3D leans Execution (Competitive PvP); Worms Clan Wars leans Execution (Competitive PvP).
Worms Clan Wars leans a little harder on execution, though the gap is small.
Worms 3D
Judging grenade arcs and wind in 3D takes real touch
Worms Clan Wars
Grenade arcs and ninja-rope control decide turns
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Worms 3D
Predicting where a human hides and strikes next matters
Worms Clan Wars
Anticipating human opponents' target priorities matters in clan play
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Worms 3D
Wind, crate drops and terrain chaos swing turns
Worms Clan Wars
Crate drops and terrain destruction add swing
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Worms 3D
Weapon economy and positioning math reward planning
Worms Clan Wars
Weapon economy and positioning plans reward forethought
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.