head to head
Neither is simply harder - they are hard in different places. Age of Empires demands more execution; Frozen Synapse demands more reads.

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

Reads · Mind & Math
A simultaneous-turn tactics game where you plot moves against a human's unseen plan and watch both resolve.
Age of Empires leans Optimization (Mind & Math); Frozen Synapse leans Reads (Mind & Math).
Age of Empires leans clearly harder on execution.
Age of Empires
APM and micro under pressure
Frozen Synapse
Simultaneous turns remove all dexterity
Frozen Synapse leans clearly harder on reads.
Age of Empires
Scouting and countering human strategies
Frozen Synapse
You must predict a human's hidden plan each turn
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Age of Empires
Fog of war and map resources
Frozen Synapse
Hidden enemy orders and fog on some modes
Age of Empires leans a little harder on optimization, though the gap is small.
Age of Empires
Build orders and eco timing dominate
Frozen Synapse
Line-of-sight geometry and timing are calculable
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.