which had been the better way to die.
Both options offer a kind of death and this line implies that soldiers are controlled by indoctrination and propaganda, and used as tools of the government. Written in a detached third-person viewpoint which might suggest the speaker doesn't agree with this cultural view.
"die" chosen as the last word of the poem, which creates a sense of futility and inevitable fate: the soldier was destined to die one way or another. The reader is also forced to reflect on their own mortality and life which will end the same way as the soldiers. In a more overarching societal application, the writer may be suggesting that conflict and patriotism denies humanity the enjoyment of life and nature.