The two most common breeds in Australia are Italian and Caucasion. There are Carniolan however they are not so popular, the bee breeders leans towards the needs of the commercial apiarist over backyard beekeepers. Russian stock was brought in to the country some years back but they haven’t taken off as their own breed. There is lots of genetic mixing, nothing wrong with that.
My favourite has to be the dark caucasions, I enjoy their docile nature and ability to winter well although they are slower to build up in spring, but they always produce a box of honey over winter whilst the Italians go through nearly all their stores.