They're both nice, but I prefer Harmony.
Lol, my dad wanted my sister and I (who are 6 years apart) to be twins so he could have named us melody and harmony ;)
I like both but I like Melody more :)
I like Melody because my sister has a friend with that name
I like both but Harmony is actually one of my choices if we have a girl. :-)
My husband likes Melody but my best friend likes Harmony