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 · Practiced Mastery
Routing efficient digs and upgrades through a randomised mine.

Optimization · Practiced Mastery
Managing scarce resources between stations while clearing scripted infected with careful shots.
SteamWorld Dig leans Optimization (Practiced Mastery); The Final Station leans Optimization (Practiced Mastery).
The Final Station leans a little harder on execution, though the gap is small.
SteamWorld Dig
Digging and platforming need modest precision
The Final Station
Headshotting infected swarms with scarce ammo demands steady aim
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
SteamWorld Dig
Enemies follow simple fixed patterns
The Final Station
Infected follow simple scripted rushes, never adapt
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
SteamWorld Dig
Randomised mine layouts hide ore and hazards each run
The Final Station
Unknown station layouts and loot until explored, then mapped
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
SteamWorld Dig
Upgrade routing and efficient dig paths drive progress
The Final Station
Rationing ammo, food and passenger care is the real game
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.