My top most priority is the use cases of that coin as this is the important step for investing into any project, if there isn't any real world usage of that coin then there isn't anything for me to invest into that project. Then I look at the team and their profiles and how old they are, if they are newly created then I avoid investing into that project. The last thing I check for is marketcap if all the tokens gets sold even including the amount of tokens held by the team of developers too as if the marketcap is already reaching more than $50 million after the ICO then the chances of making money are close to zero.
I hope these points helps to choose the best project that you ever invested into.