Check white paper firstly to identify a clear disparity, because all info about ICO can be a fake. WP gives the more information what is the project relevancy and future growth of the project. Mostly don't join high cap ICO because too many coins value will dumps once the coin launched. Check team members in google.
Whitepaper is just words that anyone can write up, there are many projects with beautiful whitepaper, but the implementation of it is an unthinkable, so do not believe too much on the whitepaper. I usually look at the profile of all the members of the project team, if they are talented people, it will be listed all on linked or google.