head to head
Neither is simply harder - they are hard in different places. Street Fighter 6 demands more execution; Warcraft III: Reign of Chaos demands more variance.

Execution · Grand Arena
A 2D fighting game where execution meets relentless yomi at neutral.

Optimization · Grand Arena
Blizzard's hero-centric RTS where build-order theory meets surgical unit micro against humans.
Street Fighter 6 leans Execution (Grand Arena); Warcraft III: Reign of Chaos leans Optimization (Grand Arena).
Street Fighter 6 leans clearly harder on execution.
Street Fighter 6
Frame-perfect inputs and combos are mandatory.
Warcraft III: Reign of Chaos
Micro of heroes and units decides fights
Street Fighter 6 leans clearly harder on reads.
Street Fighter 6
Adaptive opponent baits Drive Impacts and throws.
Warcraft III: Reign of Chaos
Scouting and out-guessing a human opponent's tech
Warcraft III: Reign of Chaos leans clearly harder on variance.
Street Fighter 6
Essentially no randomness in match outcomes.
Warcraft III: Reign of Chaos
Creep routes and item drops add randomness
Warcraft III: Reign of Chaos leans clearly harder on optimization.
Street Fighter 6
Matchup charts, frame data, and combo routes.
Warcraft III: Reign of Chaos
Build orders, creeping routes, and matchup theory run deep
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.