They are so many of good coins that can be invested on but it's good someone should make research on its self on the coin by checking all the coins details on Coinmarketcap and also choose the top ones on cmc with high volume.
After you make the best and the deepest research, you will not get the answer to this question. I always rely on the CoinMarketCap graphs - compare them, and come to the conclusions.
we could data that provided by coinmarketcap, such as biggest losser and profit.usually i short this data by my own methode till i decided which coins is best to bought.