The best is still to invest during the ICO, prices are at their lowest and there is often a bonus offered for those who buy. Of course the risk is greater than if the crypto is already listed, but the reward too.

If someone buys right after the ICO, it's probably because they've asked about the project (I hope otherwise it becomes very risky). So if everything suggests that the project is as good as taking a little bit more risk and buying during the ICO (that's what I would do)

High risks high rewards