The most accurate comparison is:
The Western Front was stagnant, but had many offensives. The Eastern Front had fewer offensives, but the front shifted considerably during each one.
This statement correctly reflects the nature of the fighting on the two fronts. The Western Front, characterized by trench warfare, saw limited territorial changes despite numerous offensives, leading to a stalemate. In contrast, the Eastern Front was more fluid, with significant movements and changes in territory, although there were fewer large-scale offensives compared to the Western Front.