Coins that tend to have other value apart from it been traded at exchanges are considered utility assets. The developers of this type of asset render a particular type of service making use of the blockchain applicable to the real world problems. The service they render actually sole real life problems through the blockchain.
This type of digital asset is good to invest in because you are sure it will stay for a very long time and the value increase as it is adopted as solution to problems.
Some of this assets include Ethereum, maid, factom etc. Do some research on others an find out what they have to offer.