Between BTC and ETH, I think have advantages of each. BTC is the first coin and coin became the highest selling price. While the ETH was the coin number two after the BTC. The number of requests for ETH in this market is very big because each project is sure to use the platform of the ETH.
Its not about who is the first. BTC isn't even the first coin even created. But its true ETH is technologically better than BTC it has a direct use over to what it will do to its network and so ETH is much useful for this aspect. It is however not going to be what the merchants are looking for when it comes to storing the value of their wealth and I guess its about popularity and the limited coin to which more than a million of the coin were lost forever.