head to head
Neither is simply harder - they are hard in different places. Aven Colony demands more variance; The Elder Scrolls V: Skyrim demands more execution.

Optimization · Pure Optimization
Expanding a self-sufficient alien colony by solving atmosphere, power, and resource chains under scripted threats.

Optimization · Pure Optimization
An open-world RPG mostly about discovering and stacking exploitable progression systems.
Aven Colony leans Optimization (Pure Optimization); The Elder Scrolls V: Skyrim leans Optimization (Pure Optimization).
The Elder Scrolls V: Skyrim leans clearly harder on execution.
Aven Colony
City management UI has no twitch dimension
The Elder Scrolls V: Skyrim
Combat is forgiving; aim and timing rarely punish you.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Aven Colony
Alien threats are scripted with no player-modelling behaviour
The Elder Scrolls V: Skyrim
Enemy AI is scripted and exploitable; not adaptive.
Aven Colony leans clearly harder on variance.
Aven Colony
Landing site resources and alien attack timing carry moderate RNG
The Elder Scrolls V: Skyrim
Loot tables and leveled lists inject mild randomness.
Aven Colony leans a little harder on optimization, though the gap is small.
Aven Colony
Colony expansion, air quality chains, and tech routing are the solvable core
The Elder Scrolls V: Skyrim
Skill stacking, enchant loops, and exploits 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.