head to head
Warcraft III: Reign of Chaos asks more than Warhammer 40,000: Dawn of War II, and the gap is optimization.

Optimization · Grand Arena
Blizzard's hero-centric RTS where build-order theory meets surgical unit micro against humans.

Execution · Grand Arena
Hero-driven squad RTS where wargear optimization and ability timing combine with reading aggressive opponents.
Warcraft III: Reign of Chaos leans Optimization (Grand Arena); Warhammer 40,000: Dawn of War II leans Execution (Grand Arena).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Warcraft III: Reign of Chaos
Micro of heroes and units decides fights
Warhammer 40,000: Dawn of War II
Hero ability activation and squad retreat timing are mechanically demanding
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Warcraft III: Reign of Chaos
Scouting and out-guessing a human opponent's tech
Warhammer 40,000: Dawn of War II
Opponent army composition and hero focus must be predicted
Warhammer 40,000: Dawn of War II leans a little harder on variance, though the gap is small.
Warcraft III: Reign of Chaos
Creep routes and item drops add randomness
Warhammer 40,000: Dawn of War II
Retreat damage, wargear drops, and map control variance add uncertainty
Warcraft III: Reign of Chaos leans clearly harder on optimization.
Warcraft III: Reign of Chaos
Build orders, creeping routes, and matchup theory run deep
Warhammer 40,000: Dawn of War II
Wargear builds and ability upgrade sequences are optimizable
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.