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.
If the decline you are referring to was that of some days back now, I think it is just the decline that majority of them use to follow when the price of bitcoin dumps, so I guess it is bitcoin price that is just affecting them. Huobi too will get to a pint where it will experience some dumps too, but still at it, Binance is still more effective than huobi.