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.

Execution · Pure Mechanics
Pioneering wireframe arcade tank combat fought in first-person vector graphics.

Execution · Pure Mechanics
Landmark FPS built on physics puzzles and tight gunplay.
Battlezone leans Execution (Pure Mechanics); Half-Life 2 leans Execution (Pure Mechanics).
Battlezone leans a little harder on execution, though the gap is small.
Battlezone
Tank aim and dodge timing under pressure
Half-Life 2
Gravity gun and shooting demand precision.
Half-Life 2 leans a little harder on reads, though the gap is small.
Battlezone
Enemy tanks follow simple fixed routines
Half-Life 2
Combine AI scripted, non-adaptive.
Battlezone leans a little harder on variance, though the gap is small.
Battlezone
Enemy spawn positions vary run to run
Half-Life 2
Almost no randomness.
Battlezone leans a little harder on optimization, though the gap is small.
Battlezone
Learning enemy behavior and scoring patterns
Half-Life 2
Linear progression with no builds.
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.