IEO and ICO is very similar. Same thing you are buying but in IEO there is a little bit upgrade. So of course upgraded one would be better.
Since its new, its better and of course we want to place our money where the hype is in place. Theres no better option but to invest on every good project for you not to miss making money, IEO might be on demand right now but ICO is still there and making good projects so try to maximis the markets opportunity.