head to head
Neither is simply harder - they are hard in different places. MLB 15: The Show demands more variance; Super Smash Bros. Melee demands more execution.

Execution · Competitive PvP
A baseball sim testing swing timing and the pitcher-batter guessing duel atop roster strategy.

Execution · Competitive PvP
A platform fighter with one of the highest execution ceilings in any competitive game, layered on top of deep human reads.
MLB 15: The Show leans Execution (Competitive PvP); Super Smash Bros. Melee leans Execution (Competitive PvP).
Super Smash Bros. Melee leans clearly harder on execution.
MLB 15: The Show
Pitch timing and swing precision set the physical ceiling
Super Smash Bros. Melee
Wavedashing, L-cancels, and tech-chasing set an extreme physical ceiling
Super Smash Bros. Melee leans clearly harder on reads.
MLB 15: The Show
Guessing a human pitcher's sequence is classic mind-gaming
Super Smash Bros. Melee
Reading DI choices and opponent adaptive habits is constant and non-convergent
MLB 15: The Show leans clearly harder on variance.
MLB 15: The Show
Batted-ball physics and simulation rolls add real randomness
Super Smash Bros. Melee
Stage hazard RNG and spawn positions add marginal chaos
Super Smash Bros. Melee leans a little harder on optimization, though the gap is small.
MLB 15: The Show
Roster building, matchups, and situational strategy run underneath
Super Smash Bros. Melee
Character matchup tiers and optimal movement routing are deeply studied
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.