NEM and Utrust I think is a good for long term holding. But if you dont mind better to take the opportunity to buy more ETH right now since the price are low and its technology is too good for the future.
The Market Capitalization of a cryptocurrency also, in a way, determines its long-term survival. When you multiply a cryptocurrencys current supply by its current price, you get the market cap of that cryptocurrency. So in general, the supply also has significant impact on the market cap. These two go hand in hand to determine the amount of cryptocurrencies left to be released and how that will translate into prices. And for me Bitcoin, ethereum,neo and litecoin are mostly the best for long term.