Sydney as it has some of the best schools and good opportunities for work. However, Adelaide might be good as it is considered as a regional area. There are pros and cons to everything.
bro can u please do a video about changing of course from a undergraduate course to certificate courses of to 2 year diploma. it is a kind request. what are the current rules and etc.
when you say "good for visa" you need to be detailed bro firstly what visa you wanted to buy note there is only 1 visa system that applies to entire australia so its a wrong question so you should have asked australia in general