Superannuation is Commonwealth law, so the nomination rules read the same in Perth and in Hobart. What changes is what happens around the benefit once it is paid, and family provision law is where the difference bites.
New South Wales is the outlier that matters. Under Chapter 3 of the Succession Act 2006 (NSW), a court can designate property that never formed part of the estate as notional estate and order provision out of it, and superannuation death benefits have been caught that way. A NSW nomination faces a family provision claim in a way it does not anywhere else, which argues for paying a dependant directly.
Victoria produced Wooster v Morris [2013] VSC 594, where a surviving trustee ignored a valid binding nomination and the daughters spent years enforcing it. Under the Powers of Attorney Act 2014 (Vic), an attorney appointed by an enduring power of attorney drafted to your state's rules who signs a nomination naming themselves enters a conflict transaction, and most funds refuse it.
Queensland gave the country its two teaching cases. In Munro v Munro [2015] QSC 61 a nomination favouring the trustee for the estate failed, because a trustee of a deceased estate is not the legal personal representative. In Donovan v Donovan [2009] QSC 26 the nomination missed the fund deed's own conditions.
Western Australia supplied Hill v Zuda Pty Ltd, which travelled up through the WA courts before the High Court settled the SMSF question, and Ioppolo & Hesford v Conti [2013] WASCA 25 on a surviving trustee's rights. De facto property matters in WA run under the Family Court Act 1997 (WA), not the federal regime.
South Australia, Tasmania, the ACT and the Northern Territory each run their own family provision statutes, from the Inheritance (Family Provision) Act 1972 (SA) to the Family Provision Act 1970 (NT). None carries a notional estate power, so a benefit paid straight to a nominated dependant stays beyond the reach of an estate claim.