It's just a bit more laid back etc. The bigger cities are like a big, loud, thumping nightclub. Adelaide is more like a quiet, chilled out lounge bar where you can have a quiet drink and a chat.Maybe I'm biased because I grew up here and still live here but I think Adelaide has a lot to offer. Adelaide Oval is a stellar ground. Yeah we don't have that 'wow' factor that other cities in Australia might have but we have a lot of charm. Great restaurants, wineries, beaches, Adelaide Hills. Less traffic. I still view us like a 'big country town' whereas cities like Melbourne have grown WAY too much it's terrifying.
There's a time and place for both, but personally I prefer the quieter option.