My opinion is, none. Get the device and play first. Read an epub and see how you like it. f you want to try a kepub, get something free from the Kobo store. Or simply rename an epub on the device to have the extension ".kepub.epub". That will work well enough to see if the differences (but, you can't save bookmarks/annotations and the reading position is at the start of the chapter).
The built-in KoboTouch driver will handle getting books to the device fine. It can also update the metadata if you change it.
Otherwise, I tend to say, all of them. You can enable or disable the KoboTouchExtended driver depending on whether you want read particular books in different format. Or you can convert to kepub with the KepubOutput plugin. In which case you also need the kepub metadata reader and writer plugins. And you may as well add the KepubInput plugin. And my Kobo Utilities has a lot of functions, but, if nothing interests you, it isn't needed. But, other than the KoboTouchExtended driver, if they are installed, they don't do anything unless you use them. The extended driver needs to be disabled if you don't want its function.
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