The Kobo will use epub, and pretty much only epub
(it does have PDF as well but I can't imagine why one would want to read PDF on such a small screen). I tried the Pocket Pro and they are two completely different sorts of devices. The Kobo is an entry level type of device and is great for if you want to read a book straight through and then read another one. But there is no file organization and to be honest it's a little slow compared to some other devices I have tried. Not slow in a deal-breaker sense for someone who reads very linearly one book at a time, but personally I have more than one book on the go and jump around a lot, so I don't think it would be my preferred device.