I think IEOs standout the most here. But there are still overhwelming projects of STO and ICO but the assurance coming from IEOs is just too great compare with the others. That is why I think it is the most popular and powerful project right now.
ICOs have still been good way to raise funds if they come from good projects. IEOs are just temporary hot trend, and will end soon. Because, there are difficult for investors to get good returns from their investments in IEOs of small exchanges. Over time, investors will stay away from IEOS of new created exchanges.