In your list Digibyte is perfect Coin for the investment Because its price is small and always fluctuating in the range of 70 Satoshi to 145 Satoshi , so we can make lots of profit with the Digibyte coin trading . IOTA is also a better Coin for the investment .
But here my suggestion for another coins is here for you , you should invest in bitcoin gold Because bitcoin gold is that coin which came from the network of the blockchain of bitcoin and that will surely result into profit for you because currently price of the coin is about 0.018btv/btg , so if you will buy then you can make easily profit , it's price in the past goes to about 0.1 btc , so you can make big if you can wait after investment to see the market of the bitcoin stable .