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.

Reads · Competitive PvP
The Wii entry whose slower pace and infamous random tripping pushed Smash toward defensive mind games.

Execution · Competitive PvP
Turn-based artillery comedy where teams of worms annihilate each other.
Super Smash Bros. Brawl leans Reads (Competitive PvP); Worms 2 leans Execution (Competitive PvP).
Worms 2 leans a little harder on execution, though the gap is small.
Super Smash Bros. Brawl
Slower engine lowers the ceiling but spacing still needs hands.
Worms 2
Ninja rope mastery and pixel-perfect grenade arcs win games.
Super Smash Bros. Brawl leans a little harder on reads, though the gap is small.
Super Smash Bros. Brawl
Defensive bait-and-punish yomi dominates its floaty neutral.
Worms 2
Human opponents bait positions and hide intentions.
Worms 2 leans a little harder on variance, though the gap is small.
Super Smash Bros. Brawl
Random tripping injects genuine uncontrollable RNG into movement.
Worms 2
Wind, crate drops and terrain randomness swing turns.
Worms 2 leans a little harder on optimization, though the gap is small.
Super Smash Bros. Brawl
Matchup knowledge and ledge play reward study within a campy meta.
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.