For long-term investment. BTC and ETH would be your best choice because of its potential, security, and sustainability. Although BTC is unstable you will earn a lot of profit on it if you know how to market works. Having patience is your key to success in long-term investment, why? because if you see the market is falling down and immediately sold your token (panic sell) and suddenly it pumps way up its a big loss for you. Buy tokens at dips and hold until it reaches the highest value.