Zu Druid or Tone + sub

Very similar. Druid is more efficient than Tone if that has any bearing. And not bothering with stands and extra cable expense argues for Druids but greater bass extension comes with the sub option. I don't think that other parameters separate the Tone and Druid. If you like one, you would like the other.

As Tvad mentioned, you will have to try them for yourself...Even after one year I have not made up my mind yet whether I am a single driver person.

Of course, you can always get a pair and resell to someone else in Australia if you don't like them. Best to try them for a while. Given the current hype of Zu that should not be to hard.

Or take a trip to Singapore...

Good luck!

buying any speaker unheard = bad idea