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

Execution · Grand Arena
A tactical hero shooter decided by aim duels and adapting to human opponents.

Optimization · Grand Arena
Blizzard's hero-centric RTS where build-order theory meets surgical unit micro against humans.
Valorant leans Execution (Grand Arena); Warcraft III: Reign of Chaos leans Optimization (Grand Arena).
Valorant leans clearly harder on execution.
Valorant
One-tap aim and crosshair placement decide most duels.
Warcraft III: Reign of Chaos
Micro of heroes and units decides fights
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Valorant
Humans constantly adapt peeks, fakes, and ability timings.
Warcraft III: Reign of Chaos
Scouting and out-guessing a human opponent's tech
Warcraft III: Reign of Chaos leans a little harder on variance, though the gap is small.
Valorant
Light spray RNG and unknown enemy positions.
Warcraft III: Reign of Chaos
Creep routes and item drops add randomness
Warcraft III: Reign of Chaos leans clearly harder on optimization.
Valorant
Agent comps, util usage, and economy are studyable theory.
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.