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 · Systems & Chaos
A ghost-noir adventure testing clue association and patient investigation.

Optimization · Pure Optimization
A LucasArts sci-fi adventure where astronauts stranded on an alien world puzzle out its dead civilization.
The Blackwell Convergence leans Optimization (Systems & Chaos); 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.
The Blackwell Convergence
Pointing and clicking has no dexterity test
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.
The Blackwell Convergence
Characters are 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.
The Blackwell Convergence
The mystery's facts are hidden until uncovered
The Dig
Alien machinery's purpose is hidden until experimented with.
The Dig leans a little harder on optimization, though the gap is small.
The Blackwell Convergence
Connecting clues and notebook entries is the core puzzle
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.