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
Engineer a pandemic; evolution order is the puzzle.

Optimization · Pure Optimization
A two-player co-op escape adventure built on describing what only you can see over voice chat.
Plague Inc: Evolved leans Optimization (Pure Optimization); We Were Here Together 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.
Plague Inc: Evolved
no reflex
We Were Here Together
Walking and interacting; minimal physical demand.
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Plague Inc: Evolved
world response scripted
We Were Here Together
Partner is an ally; puzzles never adapt.
We Were Here Together leans a little harder on variance, though the gap is small.
Plague Inc: Evolved
country event timing
We Were Here Together
Asymmetric hidden information is the core mechanic.
Plague Inc: Evolved leans a little harder on optimization, though the gap is small.
Plague Inc: Evolved
evolution order heavily solved
We Were Here Together
Fixed symbol-and-mechanism puzzles, fully solvable once both sides known.
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.