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 · Practiced Mastery
A punishing Soviet off-road logging sim about dragging timber through near-impassable mud.

Optimization · Pure Optimization
A tactical squad shooter where positioning and probability management outweigh raw aim.
MudRunner leans Optimization (Practiced Mastery); The Bureau: XCOM Declassified leans Optimization (Pure Optimization).
MudRunner leans a little harder on execution, though the gap is small.
MudRunner
Careful throttle, diff-lock and winch control matter constantly.
The Bureau: XCOM Declassified
cover shooting timing is moderate
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
MudRunner
No opponent of any kind.
The Bureau: XCOM Declassified
alien AI is scripted, no adaptation
The Bureau: XCOM Declassified leans a little harder on variance, though the gap is small.
MudRunner
Deforming mud behaves unpredictably until mapped.
The Bureau: XCOM Declassified
cover-based hit chances are randomized
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
MudRunner
Fuel, load and route planning across the map is the core test.
The Bureau: XCOM Declassified
squad tactics and builds are solvable
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.