head to head
Super Smash Bros. Melee asks more than Mortal Kombat X, and the gap is execution.

Execution · Grand Arena
A variation-based fighter where character specialisation choices and read-and-punish execution drive competitive outcomes.

Execution · Competitive PvP
A platform fighter with one of the highest execution ceilings in any competitive game, layered on top of deep human reads.
Mortal Kombat X leans Execution (Grand Arena); Super Smash Bros. Melee leans Execution (Competitive PvP).
Super Smash Bros. Melee leans clearly harder on execution.
Mortal Kombat X
Variation-specific combo routes demand precise practice
Super Smash Bros. Melee
Wavedashing, L-cancels, and tech-chasing set an extreme physical ceiling
Super Smash Bros. Melee leans a little harder on reads, though the gap is small.
Mortal Kombat X
Reading opponent's variation choice and tendency shifts the matchup
Super Smash Bros. Melee
Reading DI choices and opponent adaptive habits is constant and non-convergent
Super Smash Bros. Melee leans a little harder on variance, though the gap is small.
Mortal Kombat X
No RNG; transparent match flow
Super Smash Bros. Melee
Stage hazard RNG and spawn positions add marginal chaos
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Mortal Kombat X
Variation selection and optimal punish routes require systematic study
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.