head to head
Neither is simply harder - they are hard in different places. Super Smash Bros. Melee demands more execution; The Finals 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.
Execution · Competitive PvP
Destruction-heavy team shooter with cashout heists.
Super Smash Bros. Melee leans Execution (Competitive PvP); The Finals leans Execution (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 Finals
Movement and aim under destruction chaos
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 Finals
Cashout fights are three-team mind games
The Finals leans clearly harder on variance.
Super Smash Bros. Melee
Stage hazard RNG and spawn positions add marginal chaos
The Finals
Destruction and event modifiers shake fights
Super Smash Bros. Melee leans a little harder on optimization, though the gap is small.
Super Smash Bros. Melee
Character matchup tiers and optimal movement routing are deeply studied
The Finals
Class loadouts and gadget synergies
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.