Xero lodges BAS directly to the ATO, which is a real convenience. HelloBooks focuses on the step before that — getting the GST codes right without manual rules — and prepares the same labels.
For a Northern Territory business the practical test is narrow: does the product handle payroll tax from a$1,500,000 · up to 0.055% without you configuring it per transaction, and can your registered BAS agent work in it without another licence? Payroll tax in Northern Territory has a tax-free threshold of A$1,500,000 in annual Australian wages.