head to head
Neither is harder. They score identically on all four axes, so the difference between them is in kind, not degree.

Optimization · Pure Optimization
Staging scripted murder puzzles by learning household routines and item logic.

Optimization · Pure Optimization
Tests creative vocabulary - conjuring the right modified object for each fixed puzzle.
Lucius 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.
Lucius
Slow stealth and item use, minimal dexterity
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.
Lucius
Household NPCs follow fixed routines
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.
Lucius
Accident setups are fixed puzzles once discovered
Super Scribblenauts
Puzzles are fixed; your vocabulary is the only variable
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Lucius
Each murder is a solvable staging puzzle
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.