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 · Pure Optimization
Survival sandbox with brutal PvP base raiding.

Optimization · Pure Optimization
Castle economy and siege engineering with light real-time micro.
Conan Exiles leans Optimization (Pure Optimization); Stronghold HD leans Optimization (Pure Optimization).
Conan Exiles leans a little harder on execution, though the gap is small.
Conan Exiles
Melee and bow combat inputs
Stronghold HD
Real-time micro matters in sieges but stays modest
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Conan Exiles
PvP raids reward reading defenders
Stronghold HD
Multiplayer sieges reward predicting human attack angles
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Conan Exiles
Loot and purge events
Stronghold HD
Campaign events scripted; small skirmish unknowns
Conan Exiles leans a little harder on optimization, though the gap is small.
Conan Exiles
Base layout, thrall farming, gear progression
Stronghold HD
Castle economy and siege engineering are the dominant layer
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.