I prefer the poem Warpigs by Black Sabbath.
Surprised that no one yet has mentioned the song of the same name, by The Damned, released in 1987. Very pleasing track to my ears.
It's a great song, but as a piece of poetry it's not even in the same league imo.
(This is my all time favourite poem though)
I prefer Child In Time by Deep Purple.
Wilfred Owen would never have dared to rhyme 'masses' with 'masses'.