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

Optimization · Grand Arena
The definitive medieval RTS where castle drops and farm economies decide empires.

Optimization · Mind & Math
14-epoch RTS where economic scaling, epoch-rush timing, and civilization counter-picks span stone age to future war.
Age of Empires II: The Age of Kings leans Optimization (Grand Arena); Empire Earth leans Optimization (Mind & Math).
Age of Empires II: The Age of Kings leans a little harder on execution, though the gap is small.
Age of Empires II: The Age of Kings
Micro, villager management, hotkey speed
Empire Earth
Epoch-spanning army micro and hero management need consistent attention
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Age of Empires II: The Age of Kings
High-level play is predicting human openings
Empire Earth
Opponent epoch rush and civilization bonuses must be predicted
Age of Empires II: The Age of Kings leans a little harder on variance, though the gap is small.
Age of Empires II: The Age of Kings
Fog, map gen, civ matchups
Empire Earth
Map resource distribution adds uncertainty at start; converges quickly
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Age of Empires II: The Age of Kings
Build orders refined over two decades
Empire Earth
Epoch advancement timing and citizen allocation are near-optimally 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.