Wouldn’t you have gotten a better deal shopping at Aldi (or anywhere but Woolworths)?
In short, no: I did extensive research before this project, and for budget-price items all the major supermarkets charge the same price. Woolworths is my nearest supermarket, and that’s why I chose it; had it been a Coles or a Franklins or an Aldi, the outcome would have been pretty similar. See this much more extensive discussion on that point.