It depends on the coin. You need to do a thorough finding of the coin. In doing your finding, you have the following core Things in mind; firstly, the service there are offering and Their competitors. If they have lesser competitors or no competitor, the coin will worth investing in. Secondly, check their roadmap and see what they have done developing the coin and what they need to do in the nearest future. Thirdly, check their Whitepaper to know much about the project. Fourthly, the project team. ensure to do proper finding of the team to see if any one of them has involved in any internet crime. If all this are perfectly ok, you are good to go.