Hi there.
In my opinion, I like Huobi's IEO than Binance's IEO. Right, Binance IEO require the smaller days of holding, but the price of BNB is dumping everyday. But HT isnt, it's price increase everyday, and hard to dump (except BTC dump, all alts will dump). And the Huobi's IEO help us better profit too. From x4-x10 until now, but with Binance's IEO, some IEO is having x0.5-x2 now.
Binance and Huobi are both trusted and secure exchange, i dont think there was an issue regarding holding of the respective coins/tokens. Binance (BNB) coin is not dumping everyday or Huobi token (HT) is not increasing everyday it was dictate by the market demand so its not relevant to compare. Doing IEO on both exchange is good because both exchange are transparent with huge market and user base that advantageous to any IEO campaign.