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
Turn-based artillery comedy where teams of worms annihilate each other.
FIFA 21 leans Execution (Competitive PvP); Worms 2 leans Execution (Competitive PvP).
Worms 2 leans a little harder on execution, though the gap is small.
FIFA 21
Skill moves and finishing mechanics demand practiced hands
Worms 2
Ninja rope mastery and pixel-perfect grenade arcs win games.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FIFA 21
Outguessing a human's defensive shape and attacking patterns is central
Worms 2
Human opponents bait positions and hide intentions.
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 2
Wind, crate drops and terrain randomness swing turns.
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 2
Weapon economy and positioning theory are studyable.
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.