It's better to buy later on exchanges especiall nowadays markets are all red and some ico offers a large amount of bounties so expect a big dump
That really depends on the token if it has real intrinsic value or if it's really just meant for a 3-day pump and dump. I believe that Aitheon and Menlo One are ICOs that will sooner than later get mass adoption & will continue to grow in value since they have good teams working in the background and that the cards they bring to play on the table are just unique and brilliant. Here's an interview video with Menlo One's CEO done by Korean Jew Trading
https://www.youtube.com/watch?v=Rw1QBpBYE6o