Well, right now it's not that difficult to choose IEO. just see where IEO is, then you can conclude it. however, for ICO, it seems like we can't do something like this before confirming who they are working with. however, ICO is now starting to disappear. IEO is better because it's easier to research IEO than ICO.
That's right, it's easier for us to conclude whether IEO is good or not, just by looking at where they are. Whereas ICO is very difficult to conclude whether ICO is good or not, because Scammers can manipulate all aspects of ICO, whitepapers and even fake teams.