hmm. I would say that poetry comes more easily to me, with prose I really have to work at it where as poetry for the most part seems to just flow for me and needs hardly any editing. hints why I have far more poetry pieces than prose :/
Hmm I can work well with both. Poetry, which is my main passion. I have developed a structure, which for me, keeps it a look easier than trying to reform a structure all the time. Also it's interesting to see how I can style each poem with a different theme, rhyme scheme, and mix up the word choice/imagery. Prose, on the overhand, is a problem. Since I was a kid I've taken to over-complicating my work. Which makes something quite simple become something inflated and lost in a pile of words. Still poetry I can write off top of my head within seconds, while prose I try and form some kind of plan. Though I prefer reading prose more than poetry (not a fan of non-rhyming poetry, it has to have a sort of beat to it like a song (which is what I try to implement in my own poetry and songs)).
Hmhmhmhmhmhm.... I daresay prose is more difficult for some, and poetry more difficult for others. It's different parts of the brain, in a sense. Need to be more rhythmic for one, more detailed for the other...
Prose, because I could never write a person, mostly - that whole idea of having a character escapes me, as in, making someone up and having things done to them and knowing how they would react, and knowing how they are regarding everything? I can't do that. People are too 3D for me.
Prose also tends to require a longer attention span, I think? How do you consistent plot? I mean, if I tried to write a long story, eventually I'd get bored and throw in dragons having an epic space opera in the plot for fun.