In my opinion bitcoin is itself a best top coin to invest for long term Because each year its price is increasing 10 times , so we can think that what amount of earnings we can make easily .
Beside bitcoin my suggestion to buy reddcoin , Etherium , Etherium classic , Digibyte coin , blry coin , bitcoin gold , bitcoin diamond , regal coin , cloack coin .
I suggested these coin Because these coins are either have low price or having stability in constant increase in price day by day .
So if we can buy these coin now then we can make big earnings easily for small and long term investment .
And also we should keep in our mind that bitcoin is that coin which can be buy at any price for long term investment Because it will be profitbale always to have .