It is actually very difficult to say which cryptocurrency is the best for an investment.
There are different strategies that you can use for a long term investment and the first one is to invest on the top 10 cryptocurrencies by Market Cap. It is wise not to only invest in one cryptocurrency, but to diversify so your winnings can make up for your loses.
Etherium is next to bitcoin so this is the best clin for investment, a month ago it only amounting to 500usd per coin and now 1000usd after a month 100% increased in price.