We all know that the total supply of Bitcoins is fixed, at the end, there will be only 21 million Bitcoins.
This is not the case with Ethereum, since it is not yet known if there will be an infinity of Eths or there will be a global consensus to limit that number.
I am certain that this detail will affect the price of each one of those two coins, logically, Bitcoin price will be at least 10x Eth price.