Since most ICO projects are based on the Ethereum platform, investors should have the ETH crypto currency to buy and use tokens. ICO selects the ETH crypto currency, because by its peculiarities it easily generates tokens using a smart contract.
This is the correct opinion. I think Ethereum is the best choice for ICO. And this also makes its value independent of BTC.
The fact that bitcoin and eth are the two strongest currency so far so if I were the founder of course I'll choose the one that can grow drastically and in return I can have a good profit. Besides I can see more successful ICOs that's based on ethereum platform and can do beyond things.