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
A competitive party platformer where placing obstacles to block others while surviving your own traps tests both execution and social prediction.
Super Smash Bros. Brawl leans Reads (Competitive PvP); Ultimate Chicken Horse leans Execution (Competitive PvP).
Ultimate Chicken Horse 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.
Ultimate Chicken Horse
Precise platforming through player-built obstacle courses is the ceiling
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.
Ultimate Chicken Horse
Predicting what obstacles opponents will place is genuine social reads
Super Smash Bros. Brawl leans a little harder on variance, though the gap is small.
Super Smash Bros. Brawl
Random tripping injects genuine uncontrollable RNG into movement.
Ultimate Chicken Horse
Block placement creates novel layouts each round
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Super Smash Bros. Brawl
Matchup knowledge and ledge play reward study within a campy meta.
Ultimate Chicken Horse
Optimal obstacle placement strategies are learnable over sessions
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.