EOS will most likely be the better product verses Ethereum. The problem will be that ETH will have most of the market by the time they launch. ETH will have a ton of partnerships, adoption and use cases. While EOS will be proving its worth to the public ETH will just be strengthing their grip. EOS will run circles around ETH but now it will be a popularity battle were the better product doesn't always win.
I am in the EOS camp os I hope they win. Either way, it will be an intersesting battle. No matter which way this battle goes EOS will be here to stay.