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.

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

Execution · Pure Mechanics
A timed shooting gallery testing aim and speed against flying chickens.
Battle City leans Execution (Pure Mechanics); Die Original Moorhuhn Jagd 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
Die Original Moorhuhn Jagd
Fast accurate aiming at flying chickens is everything
Same score on reads - which means the number cannot separate them. The difference is in what each one asks of you.
Battle City
Enemy tanks follow simple scripted routines, nothing adaptive
Die Original Moorhuhn Jagd
Chickens follow scripted flight, not adapting
Die Original Moorhuhn Jagd leans a little harder on variance, though the gap is small.
Battle City
Spawn order and power-ups add mild randomness per stage
Die Original Moorhuhn Jagd
Spawn timing and paths add some unpredictability
Battle City leans a little harder on optimization, though the gap is small.
Battle City
Base-defense positioning and brick management have known best answers
Die Original Moorhuhn Jagd
Prioritizing targets for max score matters slightly
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.