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

Execution · Competitive PvP
A platform fighter with one of the highest execution ceilings in any competitive game, layered on top of deep human reads.

Reads · Competitive PvP
Open-world survival sandbox where every dinosaur stalking you is another player.
Super Smash Bros. Melee leans Execution (Competitive PvP); The Isle leans Reads (Competitive PvP).
Super Smash Bros. Melee leans clearly harder on execution.
Super Smash Bros. Melee
Wavedashing, L-cancels, and tech-chasing set an extreme physical ceiling
The Isle
Stamina management and pounce timing in chases
Super Smash Bros. Melee leans clearly harder on reads.
Super Smash Bros. Melee
Reading DI choices and opponent adaptive habits is constant and non-convergent
The Isle
Human-controlled dinosaurs ambush and bait
The Isle leans clearly harder on variance.
Super Smash Bros. Melee
Stage hazard RNG and spawn positions add marginal chaos
The Isle
Open server world hides who is nearby
Super Smash Bros. Melee leans clearly harder on optimization.
Super Smash Bros. Melee
Character matchup tiers and optimal movement routing are deeply studied
The Isle
Growth stages, diets, and territory knowledge
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.