There are many criteria to look at to understand if a coin is good or not. User adoption, quality of tech and which problem it is solving. For example, I am now very interested in a new upcoming token called EON, which will fuel a platform destined to change the way the gaming industry will function in future. I'd advise anyone to give it a look, this could possible change also your wealth, if this team, which is backed by a big group, will deliver what promised.
http://eontoken.io/