In the long term investment decision altcoins is the best choice. Altcoins is cheap and best to buy and will surely grow in many altcoins in the future. The first 100 altcoins at CoinMarketCap list the best altcoins list for investing in altcoins.
Between top 100 altcoin in marketcap there are some of altcoin that its not good to buy so dont always use the grade as reference to buy or not.
Choose from top 100 then do also research or analysis that will support your interest to any altcoin.