It's an Australianism for the VW flat-four motor cars, due to the sound of their uneven firing. What @VicarWhiskey may not know is what these things are worth now. There is a business near me that restores them starting from around 拢30k on top of the price of the base car. They also do early air-cooled Porsches and, regretably, build plastic 356 replicas on innocent Beetle chassis.
Better?............I duuno that one could be distinguished as being better than the other, both are an awful cacophony of audibly offensive mind numbing racquet, yes they are recognisably different. However it's like trying to compare the merits of vomit to diarrhea......both are nauseatingly unpleasant to encounter either 1st or 2nd hand!