The great coins that we invested for a long term maybe bitcoin or etherium. This two coins that ill know for a longterm investment, Because it is popular in a whole world. But they have some good coins also are better to invest for a long term and we can find them if need some research on it.
BTC is number one here. As for Ethereum, now, the situation is vague. However, I do believe that after the futures are approved, this altcoin will go up. I also trust it and like ETH.