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

Execution · Pure Mechanics
Twitch tank duels while protecting a base from scripted enemy waves.

Execution · Pure Mechanics
A top-down shoot-em-up testing aim and dodging against scripted alien waves.
Battle City leans Execution (Pure Mechanics); Earth Defense Force leans Execution (Pure Mechanics).
Same score on execution - which means the number cannot separate them. The difference is in what each one asks of you.
Battle City
Tank aim and dodge timing under pressure decides every stage
Earth Defense Force
Top-down shooting and dodging are the core demand
Earth Defense Force leans a little harder on reads, though the gap is small.
Battle City
Enemy tanks follow simple scripted routines, nothing adaptive
Earth Defense Force
Enemies are scripted waves, not adaptive
Earth Defense Force leans a little harder on variance, though the gap is small.
Battle City
Spawn order and power-ups add mild randomness per stage
Earth Defense Force
Enemy spawn patterns add some unpredictability
Same score on optimization - which means the number cannot separate them. The difference is in what each one asks of you.
Battle City
Base-defense positioning and brick management have known best answers
Earth Defense Force
Weapon management and positioning aid survival
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.