I have gathered that Mina and eco are two solid projects based on my research and general sentiment and also analyst opinion.
If you think those are good projects, that's okay for you to buy the coins. I am sure you have analyzed the two projects as a whole and details. Also, it is a correct way to choose the coins yourself if you already have sufficient knowledge to determine proper coins/projects to join. You are better to not rely on the people to choose coins/tokens for investment.