There is almost no invest able altcoins in the long term. You can gain profit from the short term investment but you need to get informed before everybody else. Altcoins come and go very fast. Pump - dump - then death. Only few altcoins can survive for a longer time. Dogecoin and Litecoin for example. These two altcoins maybe best for investment.
It depends on the continuous development of the coin. If there is active developers like Etheruem, it can be invested.
This is why BigUp is a great choice. BigUp stake rate was designed for long-term gain without putting too much pressure from an overabundance of coins
BigUp has been described as one of the best PoS coins to hold and stake
BigUp does have a premined amount of coins but those are being used for development of a long-term strategy to keep BigUp progressing indefinitely
This BigUp community is also very big and growing rapidly. Many developments and innovations for BigUp have come from the community so there is no dependence on any single person or entity
BigUp is unstoppable and invest-able... By design