Lots of coin in the crypto world now, making it difficult to know coins worth holding or investing in. However go through the purpose in which the coins are created for, what do they tend to offer as service, you can get this info from coinmarketcap.

Wishing you happy trading

From my analysis and articles read online, i think ETH will be more valuable in the future considering its purpose of creation and the function it will serve.

The growth is steady, which is a good sign of a good foundation. However LTC seems good as it has been labelled Bitcoin v2.0