From what I have heard (I do not use Qimage), I suggest you get Qimage Ultimate instead of Qimage One, because more people use Qimage Ultimate, so more people will be able to answer your questions, help you, and offer suggestions. Also, I'm not sure about in Denmark, but in the U.S., Qimage Ultimate costs only $10 more than Qimage One.
The original Qimage was only for Windows, and then a couple of years ago the company that makes it (DDI Software) had another company (Binartem) build Qimage One mostly for Mac OS, so that there would be a Mac version. If you were still on the iMac, then you would have to get Qimage One. But because you are moving to Windows, you can choose any version.