Very very effective, Investors are not throwing any money to ICO as there is so many scams in the community.
IEO will give assurance that the money is safe and there will be exchange after the sales.
IF the IEO will place in a big exchange another percentage will add to victory.
ICO is more effective because the coins are launched within the year.
ICO has not been launched recently at all, only raising funds. and they collect small amounts because people have stopped investing in ICO projects. trust IEO longer, as there is some piece of software by the exchange