i dont think its a good idea to keep it. specially if you're planning to trade it after a year or something. sometimes the coin will lost its value. however if you pick a good coin to invest on, it will be great then. and when choosing a good quality coin, you should remember this. check the potential of that coin on the market by following thier bounty updates.
there are do many coin that is gold for trading, but I suggest the most popular which is bitcoin and etherium maybe both coin is more popular than any other altcoin on the crypto currency feild, bitcoin is more amazing and it can really give us a huge amount of profit in the near future so then I believe that it is a good coin to trade.