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

Reads · Competitive PvP
Asymmetric horror PvP where four survivors out-think one human killer.

Execution · Competitive PvP
A platform fighter with one of the highest execution ceilings in any competitive game, layered on top of deep human reads.
Dead by Daylight leans Reads (Competitive PvP); Super Smash Bros. Melee leans Execution (Competitive PvP).
Super Smash Bros. Melee leans clearly harder on execution.
Dead by Daylight
chase loops, skill checks, and 360 dodges
Super Smash Bros. Melee
Wavedashing, L-cancels, and tech-chasing set an extreme physical ceiling
Super Smash Bros. Melee leans clearly harder on reads.
Dead by Daylight
killer-survivor mind games never stop adapting
Super Smash Bros. Melee
Reading DI choices and opponent adaptive habits is constant and non-convergent
Dead by Daylight leans clearly harder on variance.
Dead by Daylight
map, perk, and pallet RNG shapes each trial
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.
Dead by Daylight
perk builds and loop routes are studied
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.