Why were the trenches dug by the French and British worse than those dug by the Germans?

Explanation:

The trench system on the Western Front in World War I—fixed from the winter of 1914 to the spring of 1918—eventually stretched from the North Sea coast of Belgium southward through France, with a bulge outwards to contain the much-contested Ypres salient. Running in front of such French towns as Soissons, Reims, Verdun, St. Mihiel and Nancy, the system finally reached its southernmost point in Alsace, at the Swiss border. In total the trenches built during World War I, laid end-to-end, would stretch some 35,000 miles—12,000 of those miles occupied by the Allies, and the rest by the Central Powers.

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