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Adobe PDF ebooks are PDFs, but they are supposed to be PDFs suitable for ebook reading. This means that they usually work ok on devices like the Cool-er, although with some ebooks there are artifacts and with all ebooks you can still see the original page breaks of the paper book. So if you have a choice, get ePub but if only PDF is available this is should be good enough.
Note that with Amazon you will be locked into ebooks they have the right to sell in Australia. With Adobe ebooks, there are many ebook stores and in some you can work around their geographical restrictions to buy US (say) ebooks.
It is possible to strip the DRM (encryption) from Adobe ebooks, and then convert them using Calibre to MOBI for the Kindle. It is also possible to strip the DRM from Kindle ebooks, which can be bought using Kindle for PC without a Kindle, and then convert them using Calibre to ePub for other devices. I don't know the legal status of doing so in Australia, but when done for personal use on ebooks you bought it harms no one.
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