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

Optimization · Pure Optimization
An MMORPG dominated by theorycraft, gear math, and rotation execution.

Optimization · Pure Optimization
A slower, more deliberate MMORPG where optimal preparation and class knowledge define performance.
World of Warcraft leans Optimization (Pure Optimization); WoW Classic leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
World of Warcraft
Rotation APM and mechanics matter in raids
WoW Classic
Slower combat reduces twitch ceiling versus retail
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
World of Warcraft
PvP arenas have light read element
WoW Classic
World PvP and battlegrounds involve real human prediction
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
World of Warcraft
Loot tables and crit RNG present
WoW Classic
Resist RNG and gear drops add meaningful hidden randomness
World of Warcraft leans a little harder on optimization, though the gap is small.
World of Warcraft
Gear, talents, and rotation are mathematically solved
WoW Classic
Class specs, consumable lists, and dungeon routes are deeply solvable
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.