As Thomas very rightly remarked above, it was indeed Burns who said both are basically the same. Anyway, I liike and enjoy both. However, the slight difference is that the meter of a poem is basically dictated by the number of syllables in a line (I assume we're talking about rhyming poems), so the rhyming patterns are pretty well fixed. In music, though, a syllable does not necessarily count for only one beat. There can be intervening beats between words or syllables, so that lines of completely unequal length can still rhyme just fine. Also, since poems don't have a rhythm section and melody to prop them up, the words had better be damned strong.