While both can be used for fundraising, they still have significant differences. Fundraising on Ethereum is more decentralized, while fundraising on the Binance platform is no doubt purely centralized. I'm pretty sure some people still prefer the former than the latter.
Along with that, take note that ICOs isn't the only thing that Ethereum is trying to do.
No doubt both are doing great in the crypto industry but there are differences between the BNB and ETH. Similarities are not much but differences exist and that is why BNB has its price while ETH has its own. Binance coin is centralized while Ethereum is not centralized and both are them are using for fundraising. The current price of Ethereum is again showing the bullish trend of 2017 happened in past.