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

Optimization · Pure Optimization
Quiet side-scrolling journey piloting a land-ship across a dried-out sea.

Optimization · Pure Optimization
Tests creative vocabulary - conjuring the right modified object for each fixed puzzle.
FAR: Lone Sails leans Optimization (Pure Optimization); Super Scribblenauts leans Optimization (Pure Optimization).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
FAR: Lone Sails
Light platforming and timely lever pulls
Super Scribblenauts
Stylus control matters slightly, never decisively
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
FAR: Lone Sails
No opponent of any kind
Super Scribblenauts
Solo sandbox - nothing models you
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
FAR: Lone Sails
Mostly fixed obstacles, minor unknowns first run
Super Scribblenauts
Puzzles are fixed; your vocabulary is the only variable
Super Scribblenauts leans a little harder on optimization, though the gap is small.
FAR: Lone Sails
Fuel management and ship-routine efficiency are the game
Super Scribblenauts
Finding object-adjective combos that satisfy each puzzle is the 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.