IEO is better than ICO in many ways, the best reason is safety. People feel safe in IEO projects than ICO, therefore investors can join happily as they will get the token within a very short time
The little difference in IEO and ICO are the exchange site which acts as an escrow between the project owners and investors for successful investment/transaction but that doesn't guarantee a safe return for the investors.
they know when the token trading will start! But in ICO, no one knows when they will list on the exchange, they can cheat easily. I always prefer reputed exchange for IEO, people should avoid average types of exchange for IEO investment.
No, investors can also when token or coin exchange listing will happen cause it usually stated in the project road map and in IEO project owners can also easily cheat if they want either but investors are the one which ought to do their homework in terms of selecting the right project.