and what mining machine is best for that alt-coin.
I think the best profitable Altcoins are those that are ranked based on price, popularity as well as the demand which can be searched easily through world wide web. Among those cryptocurrencies (Altcoins) that are ranked, we can see that Ethereum is still making its way into the top spot since aside from the dependency from Bitcoin, most Altcoins also rely into the price of Ethereum as well which makes it another option for trading pairs. I think with that stand, Ethereum is relevant to be proclaimed as the best profitable Altcoin for mining. Though everyone on the ranking can also be profitable as well. Now, choosing the most profitable Altcoin will now vary depending on the point of view of every miner and trader but for me, I find Ethereum as the best profitable Altcoin.