head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Execution · Competitive PvP
A sprawling military simulator where realistic ballistics and planning beat reflexes.

Execution · Competitive PvP
Artillery aim and turn planning against human opponents on destructible terrain.
Arma 2 leans Execution (Competitive PvP); Worms Clan Wars leans Execution (Competitive PvP).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Arma 2
Ballistics, stance, and positioning over twitch aim
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.
Arma 2
Human squads in PvP scenarios adapt
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.
Arma 2
Vast terrain hides enemy positions
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.
Arma 2
Doctrine, loadouts, and mission 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.