Some dongles are locked to a particular carrier, or particular person who registered it first. (I got caught with a Telstra dongle on eBay which couldn't be registered to anyone else)
I did the same shopping excercise recently and went with a DODO USB, which uses the Optus network. Haven't had any reception issues yet, including around Tassie and their prepaid plans are very competitive, especially the time you have to use the credit.
I have a 15GB prepaid with a year to use it.
Telstra Next G has the best coverage outside cities & major regional areas, but their plans/pricing is outrageous.
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