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 · Pure Optimization
A tower-defense game mixing snowball action with scripted-wave strategy.

Optimization · Pure Optimization
A tactical squad shooter where positioning and probability management outweigh raw aim.
South Park Let's Go Tower Defense Play! leans Optimization (Pure Optimization); The Bureau: XCOM Declassified leans Optimization (Pure Optimization).
The Bureau: XCOM Declassified leans a little harder on execution, though the gap is small.
South Park Let's Go Tower Defense Play!
Snowball aiming adds light action demands
The Bureau: XCOM Declassified
cover shooting timing is moderate
South Park Let's Go Tower Defense Play! leans a little harder on reads, though the gap is small.
South Park Let's Go Tower Defense Play!
Enemy waves are scripted, no adaptive opponent
The Bureau: XCOM Declassified
alien AI is scripted, no adaptation
Same score on variance - which means the number cannot separate them. The difference is in what each one asks of you.
South Park Let's Go Tower Defense Play!
Wave order unknown first time, then fixed
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.
South Park Let's Go Tower Defense Play!
Tower placement and resource management solve each map
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.
full breakdown
South Park Let's Go Tower Defense Play! →
full breakdown
The Bureau: XCOM Declassified →