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

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

Reads · Mind & Math
Slow-burn tank PvP with deep meta.
Age of Empires leans Optimization (Mind & Math); World of Tanks leans Reads (Mind & Math).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Age of Empires
APM and micro under pressure
World of Tanks
Aim and lead matter but slow
World of Tanks leans a little harder on reads, though the gap is small.
Age of Empires
Scouting and countering human strategies
World of Tanks
Map positioning versus humans is reads
World of Tanks leans a little harder on variance, though the gap is small.
Age of Empires
Fog of war and map resources
World of Tanks
Shell RNG and matchmaking swing fights
Age of Empires leans a little harder on optimization, though the gap is small.
Age of Empires
Build orders and eco timing dominate
World of Tanks
Tank loadouts and crew skills 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.