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
Football sim testing execution and opponent reading under a studied tactical meta.

Execution · Competitive PvP
Artillery aim and turn planning against humans under wind and crate randomness.
FIFA 21 leans Execution (Competitive PvP); Worms Battlegrounds leans Execution (Competitive PvP).
FIFA 21 leans a little harder on execution, though the gap is small.
FIFA 21
Skill moves and finishing mechanics demand practiced hands
Worms Battlegrounds
Grenade arcs and ninja-rope control reward precise aim
FIFA 21 leans a little harder on reads, though the gap is small.
FIFA 21
Outguessing a human's defensive shape and attacking patterns is central
Worms Battlegrounds
Human opponents adapt positioning and bait retaliation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 21
Deflections, finishing RNG and pack luck colour outcomes
Worms Battlegrounds
Wind, crate drops and terrain destruction add chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 21
Meta formations, custom tactics and squad building are studied deeply
Worms Battlegrounds
Weapon economy and turn order planning are solvable
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.