Better or worse, it depends on which exchanges you choose to join their IEOs, and which companies you choose to join their ICOs. Joining good ones will results in good things (profits for your investments). In contrast, choosing bad ones will likely cause losses. There is no guarentee that invest into IEO is better and will lead to certain profits, whilst invest into ICOs is worse and will cause losses for investors. It is too objective to judge which one is better between ICOs and IEOs, without details of each pair of ICO and IEO use to compare.
Most IEO investors, especially the ones carried out on Binance has testified to the massive increase they get on their investment due to the supply that becomes limited once they hit an exchange, but the one challenge I see with it is that, the way they have first come first serve in participating in these IEO is the same way they will have firstcome first serve in taken profit, because there is no way all of them can take profit, as one investors takes, it will dump the price for others.
I don’t think IEO investors are really there to Hold the coin for long, they are just there to make profit, and so the problem of IEO majorly will be dumping, which I strongly advise before this one destroys IEO reputation again.