Your first questions has been answered already by few post above and the explanation is quite clear already based on their difference. Now the last question is quite tricky, cause to be honest it will be your guide as a trader and why you should pick a good set of trading asset to focus in or cryptocurrency to work on. Now coin are much complicated than tokens in terms of technology but I could say they are the one whom have more works done than simply rent on a smart chain contract. Now as a trader you can grasp which one has potential and more criteria for improvement actually it's a matter of understanding and use cases of the project.