Actually none!

All ICO review sites have payed someone to promote the ICO they have interests on.

Then you follow them and also buy, but at a higher cost.

When the ICO is released the majority have a pump, they sell for 10x they have bought, the majority holds because the same youtubers that are payed to promote the ICO say to hold, there's a big dump and you loose the money.

Or they hold your money because they have changed something on the roadmap

Or they close the website

Or they make an internal exchange where you are obliged to trade and loose value

Or they freeze the withdraws

There are so many ways of you to lose money on a ICO that all those that rates them cannot know if the ICO is oging to work or not.

Advice from someone who has lost a lot of money. Don't go that way.