I think IEO will be a little better than ICO, but only a little little better.
The exchanges will normally check the project and then decide whether accept for IEO or not, which means at least a huge amount of scams will be filtered out.
But like the latest IEO in Bittrex, you will loose almost all of you MONEY
An Example:
ICO: 1000 new projects and 990 fail
IEO: 100 new projects and 90 fail
This example may show the difference of 10 successful projects for the 2 crowdfund process but the success rate are different. ICO will be 1/100 while IEO is 10/100. However, IEO still looks younger and the adoption just increased. We also are getting to know some atrocities perpetrated by exchanges in the past 2 year, which could give more understanding in making choice between the 2. There would be more revelation into this as more tokens get listed through IEO in the future.The exchanges will normally check the project and then decide whether accept for IEO or not, which means at least a huge amount of scams will be filtered out.
But like the latest IEO in Bittrex, you will loose almost all of you MONEY
An Example:
ICO: 1000 new projects and 990 fail
IEO: 100 new projects and 90 fail