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 aim and turn planning against human opponents on destructible terrain.

Execution · Competitive PvP
Turn-based artillery duels testing shot judgement, opponent prediction, and weapon economy under wind.
Worms Clan Wars leans Execution (Competitive PvP); Worms World Party leans Execution (Competitive PvP).
Worms Clan Wars leans a little harder on execution, though the gap is small.
Worms Clan Wars
Grenade arcs and ninja-rope control decide turns
Worms World Party
Precise angle and power judgement on every shot matters
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Worms Clan Wars
Anticipating human opponents' target priorities matters in clan play
Worms World Party
Human opponents reposition and bait - predicting them wins games
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Worms Clan Wars
Crate drops and terrain destruction add swing
Worms World Party
Wind, crate drops and terrain destruction add real chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Worms Clan Wars
Weapon economy and positioning plans reward forethought
Worms World Party
Weapon selection, positioning and turn economy 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.