I haven't travelled as much as some, but I've travelled enough to learn that nowhere has the monopoly on the best way of life. Australia has great weather and a relaxed outdoors lifestyle, but few opportunities in technology, not much cultural life, and an over-reliance on cars. London has amazing energy and cultural institutions, but it is crowded and expensive. Then consider that things which are important now might not be important in ten years time.

There is no best place to live. There is just the best place to live for you right now.