Unique wildlife - you won't find kangaroos, emus, wombats or quokkas anywhere else
Online services - They're both good, but IMO Australian government websites are slightly better than the Canadian ones. There's also myGov and things getting integrated into it slowly but surely to become one login for everything government.
PBS - AU's Medicare edges out over Canada due to this. Nearly free/heavily subsidised meds. I'm not using it yet but I'm glad it's there when I'll need it.
Coffee - Australia's coffee scene is right up there with Italy, thanks to Italian immigrants in Melbourne. Aussies also invented the flat white, nuff said. If you really really like coffee you chose well in Australia. You will be absolutely spoiled here on how the coffee is so good.
Food - Beef is generally cheaper than pork, and dairy is relatively cheap (notice how big the milk section is on a grocery store)
Monies - Highest minimum wage in the world and no tipping is expected. Tradies/blue-collar work isn't stigmatised or classed as a "lower" type of work compared to other countries.
Culture - There's that chill laid back "she'll be right" culture. Australia also fully adopted the metric system so leave your calories and inches behind. On leave, Australia starts off with a minimum of 4 weeks leave right off the bat instead of leaving it to states/provinces to decide.
Beaches/nature - No question if you're more of the beach type than the ski/snowboarding type. Need something to fill up your Instagram feed? Pop over to one of the many beaches along the coast and point your camera anywhere. If you want to see snow you can always go to NZ, Japan, or one of the local Aussie resorts up in the mountains like Thredbo.