Altcoins are among the most challenging to pick.  The biggest challenge is to choose which coin from thousands of coins in the market, which coin to get profit from.  When someone gets a good profit from a coin, that coin becomes his favorite.  Personally, my first favorite altcoins Ethereum  and this coin is the most trusted of all altcoins.  Apart from Ethereum I would prefer to invest in the top ten coins as current investments and holding until the upcoming Bullrun will yield huge profits from the coins.