I think that Binance is currently the leader in IEO. No wonder token BNB has recently flown up to the moon. Of course, I understand cryptocurrency users, because every investor can get guarantees if IEO conducts a truly reputable trading exchange.
Although Binance is a hype project, this feature is combined with its reliability. It is the best variant for today. Bittrex is also an OK variant. In any case, for a successful exchange choice, you need to carefully study all the analytics available on this topic, but even after that, your decision will be made at your own risk. For instance, this year, hacker attacks nearly ruined the Cryptopia exchange, famous for listing new and not very well-known coins.