You should know that IEO and ICO are both capital calls but different forms. there will be no better one, we need to choose potential projects to invest, if we choose wrong we have to pay dearly.
Especially for IEO, if you choose to have one of the bad exchanges like Yobit, Latoken, P2PB2B, Vindex or Probit, you will definitely lose money. because the projects listed there are all shit projects and have no future.