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

Execution · Competitive PvP
Supercell's snappy top-down team brawler built around three-minute objective fights.

Execution · Competitive PvP
Artillery aim and turn planning against human opponents on destructible terrain.
Brawl Stars 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.
Brawl Stars
Aim, dodging, and ability timing in real time
Worms Clan Wars
Grenade arcs and ninja-rope control decide turns
Brawl Stars leans a little harder on reads, though the gap is small.
Brawl Stars
Human teams rotate, bait supers, and adapt
Worms Clan Wars
Anticipating human opponents' target priorities matters in clan play
Worms Clan Wars leans a little harder on variance, though the gap is small.
Brawl Stars
Bush ambushes and power-cube spawns hide information
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.
Brawl Stars
Brawler matchups and map strategy are learnable
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.