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

Optimization · Pure Optimization
Iterating cause-and-effect sequences to untangle a fixed narrative puzzle.

Optimization · Pure Optimization
A life simulator where planning schedules and needs against a solvable system is the real game.
Last Day of June leans Optimization (Pure Optimization); The Sims 4 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.
Last Day of June
Slow walking and simple interactions, no dexterity
The Sims 4
no physical skill ceiling at all
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Last Day of June
No opponent - a fixed narrative system
The Sims 4
no opponents, simulated NPCs only
Last Day of June leans a little harder on variance, though the gap is small.
Last Day of June
Consequences of changes are hidden until tried
The Sims 4
minor random events and needs decay
The Sims 4 leans a little harder on optimization, though the gap is small.
Last Day of June
Sequencing the four characters' actions is the puzzle
The Sims 4
life and career system optimization dominant
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.