I don't know what the price of the EOS tokens is in the ICO as it is unknown until the end of the ICO (Correct me if I am wrong). There may be advantages in buying through the ICO, if the demand is not there the token is in the ICO will be a lot cheaper.

However if the demand is great then the price of the ICO tokens will be valued higher and less tokens will be distributed per ETH.

Maybe we need to hedge our bets and buy some in the ICO and on the exchanges. I really don't know, just thinking through my strategy how to obtain EOS tokens.