head to head
Warcraft III: Reign of Chaos asks more than Age of Empires, and the gap is execution.

Optimization · Mind & Math
The original historical RTS of advancing ages, booming economies, and rushing armies.

Optimization · Grand Arena
Blizzard's hero-centric RTS where build-order theory meets surgical unit micro against humans.
Age of Empires leans Optimization (Mind & Math); Warcraft III: Reign of Chaos leans Optimization (Grand Arena).
Warcraft III: Reign of Chaos leans clearly harder on execution.
Age of Empires
APM and micro under pressure
Warcraft III: Reign of Chaos
Micro of heroes and units decides fights
Warcraft III: Reign of Chaos leans a little harder on reads, though the gap is small.
Age of Empires
Scouting and countering human strategies
Warcraft III: Reign of Chaos
Scouting and out-guessing a human opponent's tech
Age of Empires leans a little harder on variance, though the gap is small.
Age of Empires
Fog of war and map resources
Warcraft III: Reign of Chaos
Creep routes and item drops add randomness
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Age of Empires
Build orders and eco timing dominate
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.