RL is the Number 1 sport in NSW and Qld, but AFL rules the roost elsewhere.
Pros to moving out are lifestyle and the general strength of the economy, and Aussies are generally easy to get on with. If you have kids, then Australia is likely to be a much better bet for their future lives than the UK.
On the Con side, I read somewhere that a significant number of Brits who 'emigrate' to Oz end up returning to the UK. I'd put that down to it simply being a massive move, entailing genuine separation from friends and family in the UK. There's also a bit of a culture shock in terms of TV, news etc but you get over that. I certainly wouldn't underestimate the potwential homesickness. I've felt it a bit myself at times - if I didn't have kids there are probably a few times when I would have seriously considered moving back to England.
The other 'con' is that the cost of living here has gone up massively compared to the UK in the time I've been here - and that's including the fact that the Aussie dollar buys 50% more than it did compared to Sterling back then. House prices have gone up to ridiculous levels in most cities. Last year when I returned to the UkKfor a visit, I was really surprised at how relatively cheap things were - my memory is of being stunned at how cheap everything was in Oz when I arrived.
Bottom line is, make your own decision, and view it as a fantastic potential experience that will hopefully work out and become permanent.
