...Both of them are virtually the same - low cost / good quality smart cases
Except that the Poetic one has a three panel cover and the Khomo has a four panel cover. My experience is that four panel covers are more stable and make a stronger triangle when you use it as a handle in portrait or typing in landscape.
*edit*
Just noticed that the Mini retina case is three panels as well. The one I have on my Mini 1 is four panels. Bleh to three panel covers.