For me the best coin is bitcoin, cause of all the coins , bitcoin remains at the top in terms of its value, a high value means a high opportunity for you to invest in there. So I suggest invest in bitcoin when its price is low, and then sell it when its high so that you'll gain profit, one more thing is that, Bitcoin is a well known coin everywhere yyou go theyknow bitcoin, and someday all of us will pay tru it.