There's "no best way" to buy. Most times, Investing in the actual IEO is the best. Other times buying after its listed is best too. I've seen situations where buying after the listing is a more better option. One time, an IEO I invested in went downhill in terms of returns. Literally, It went below the IEO price and lot of investors sold and then the reversal came and it did a solid 5x from there.On the other hand, I can't count the number of IEOs that people were better off investing that buying after it was listed.