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
Piecing together a scripted murder conspiracy from hidden clues.

Optimization · Pure Optimization
A LucasArts sci-fi adventure where astronauts stranded on an alien world puzzle out its dead civilization.
Post Mortem leans Optimization (Pure Optimization); The Dig 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.
Post Mortem
Point-and-click interface, zero dexterity
The Dig
Point-and-click; no reflex demands.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Post Mortem
Suspects follow scripted dialogue trees
The Dig
Alien world is static; companions follow scripts.
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
Post Mortem
The conspiracy is hidden information revealed by investigation
The Dig
Alien machinery's purpose is hidden until experimented with.
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Post Mortem
Piecing fixed clues into the solution is the game
The Dig
Machine puzzles have single fixed solutions to deduce.
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.