head to head
Neither is meaningfully harder - they pose close to the same test. The widest gap is execution, and it is a single point.

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
The definitive classic Street Fighter II revision and a founding tournament fighter.
Super Smash Bros. Melee leans Execution (Competitive PvP); Super Street Fighter II Turbo leans Execution (Competitive PvP).
Super Smash Bros. Melee leans a little harder on execution, though the gap is small.
Super Smash Bros. Melee
Wavedashing, L-cancels, and tech-chasing set an extreme physical ceiling
Super Street Fighter II Turbo
One-frame links, charge timing, and strict motions
Super Smash Bros. Melee leans a little harder on reads, though the gap is small.
Super Smash Bros. Melee
Reading DI choices and opponent adaptive habits is constant and non-convergent
Super Street Fighter II Turbo
Footsies and throw mixups against an adapting human
Super Smash Bros. Melee leans a little harder on variance, though the gap is small.
Super Smash Bros. Melee
Stage hazard RNG and spawn positions add marginal chaos
Super Street Fighter II Turbo
Minor damage variation; everything else visible
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
Super Street Fighter II Turbo
Matchup knowledge and super meter spend are studied lines
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.