If ICO wasnt been plague by scammers acts ICO will way better than IEO, ICOs are programmed to run on the projects very own website and no any third party involvement at all so any fund raised will go directly to the dev or project team, no loss of funds to scam exchanges,after some successful IEO fund raise on some exchanges they dont bother to send the funds back to the project teams
ICO and IEO was the same in terms of fundraising method, the only improvement was only the security since the tokensale was made inside the exchange and the exchange acted like a escrow to the funds that raised from token offerings, While ICO fraud was continue to wreaking havoc on the ICO market, in the other hand IEO was already gaining ground from the heart of investors. No doubt IEO was the new rising star for fundraising in the crypto-space. But its different when IEO was made on the fraudulent and shady looking exchange i think thats the team own mistake.