head to head
Neither is simply harder - they are hard in different places. Major League Baseball 2K7 demands more variance; Super Smash Bros. Melee demands more reads.

Execution · Competitive PvP
A baseball simulation built on pitch-timing and batter-pitcher prediction.

Execution · Competitive PvP
A platform fighter with one of the highest execution ceilings in any competitive game, layered on top of deep human reads.
Major League Baseball 2K7 leans Execution (Competitive PvP); Super Smash Bros. Melee leans Execution (Competitive PvP).
Super Smash Bros. Melee leans clearly harder on execution.
Major League Baseball 2K7
Pitch and swing timing decide most at-bats
Super Smash Bros. Melee
Wavedashing, L-cancels, and tech-chasing set an extreme physical ceiling
Super Smash Bros. Melee leans clearly harder on reads.
Major League Baseball 2K7
Pitch-selection mind-games against humans matter online
Super Smash Bros. Melee
Reading DI choices and opponent adaptive habits is constant and non-convergent
Major League Baseball 2K7 leans clearly harder on variance.
Major League Baseball 2K7
Hit and fielding outcomes add measured randomness
Super Smash Bros. Melee
Stage hazard RNG and spawn positions add marginal chaos
Super Smash Bros. Melee leans clearly harder on optimization.
Major League Baseball 2K7
Roster and franchise management form a solvable layer
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.