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
A LucasArts sci-fi adventure where astronauts stranded on an alien world puzzle out its dead civilization.

Optimization · Systems & Chaos
A fairy-tale adventure testing patient discovery of fixed puzzle solutions.
The Dig leans Optimization (Pure Optimization); The Night of the Rabbit leans Optimization (Systems & Chaos).
The Night of the Rabbit leans a little harder on execution, though the gap is small.
The Dig
Point-and-click; no reflex demands.
The Night of the Rabbit
Pointing and clicking has no motor ceiling
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
The Dig
Alien world is static; companions follow scripts.
The Night of the Rabbit
No opponent of any kind to predict
The Night of the Rabbit leans a little harder on variance, though the gap is small.
The Dig
Alien machinery's purpose is hidden until experimented with.
The Night of the Rabbit
Puzzle solutions are hidden information until discovered
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
The Dig
Machine puzzles have single fixed solutions to deduce.
The Night of the Rabbit
A walkthrough trivialises it - puzzles have fixed solutions
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.