IEO is better than ICO for investors, especially in terms of investment security. Because by investing in the IEO that directly buys from the exchange, it will keep away from scam or fraud. The number of ICO scams makes IEO good for investing in certain projects. In addition, the existence of the IEO will provide convenience to enter into the market after the project is completed
The only thing IEO is better than ICO is listing on the exchange after token sale. It's guaranteed.
Safer? Hardly. We have already seen that dubious projects may appear even on well-known exchange. It's just easier for the majority to transfer responsibility to exchange than to choose independently from dozens of projects.
IEO is a trendy three letter now. About two years back other letters were in fashion, and now some people think that if the project is conducting ICO and not IEO, than project is scam and it's doomed to failure

IEO can get a bad name as quickly as ICO...
Everything will depend on what IEO evolve into. It"s necessary to say thanks to the competition between the exchanges, it makes them modernize the IEO