How to find a promising ICO?
You can search on specialized sites with ratings. When I need to find prospective ICO, I do it. There are at least two sites with ratings, I give links:
https://icobench.com/ and
https://foxico.io/. Good luck in the search for high-yielding ICO!
I like both of the sites you mentioned ICObench and Foxico. Nice to work with at lest two of the sites. Be careful for sites that let ICOs pay their way to the top.