head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is optimization, 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
Football sim testing stick execution and reading a human opponent's tactical habits.
Brawl Stars leans Execution (Competitive PvP); FIFA Soccer 11 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
FIFA Soccer 11
Pass timing, dribbling and finishing demand stick skill
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Brawl Stars
Human teams rotate, bait supers, and adapt
FIFA Soccer 11
Human opponents' defensive habits and attacking patterns must be modelled
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Brawl Stars
Bush ambushes and power-cube spawns hide information
FIFA Soccer 11
Deflections and keeper behaviour add bounded chaos
Brawl Stars leans a little harder on optimization, though the gap is small.
Brawl Stars
Brawler matchups and map strategy are learnable
FIFA Soccer 11
Formations, tactics and squad knowledge shape matches
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.