I prefer buying ICO now on the exchange because of the price drop after the ICO. Before now I used to buy ICO during the sale and make huge profit. Since last year I notice that the majority of the ICOs launched in the exchanges were far below the price of the ico and investors were losing more and there was a lot of complaint from investors. This has affected ICO of recent. Few ICOs can hardly reach their hard cap because investors don't want to invest in ICO and find out that there is a price drop after exchange launch. The disappointing thing is that they will promise you that the ICO will become so and so price increase after launch but the reverse is always the case.