Speaking as someone who lives in Perth, I don't think Aussie Invader realistically has a chance. It's a bloke in a shed operation compared to Bloodhound who have some serious funding and engineering support. That's not to denigrate their efforts but the Bloodhound mob are operating at a different level.
They have the form of the previous successful attempt so they are not going entirely into the unknown.
Mind you I still wouldn't drive either of them and full credit to anyone who is prepared to strap something like that on and go for it.