Dash is pretty old altcoin but bitcoin will always dominate market, Ethereum has lots of potential and price & demand for ETH is already rising.
Bitcoin will always be used as payment method while ethereum will be used to invest in ICO and to gamble in smart contract based platform like vdice, cryptokittens etc.
ETH can have many applications while bitcoin will be kind of crypto payment.
However dash is not that much older than bitcoin. Among all the crypto currency bitcoin is the only currency comes to the crypto market first time by satoshi. I see many people having bitcoin is like a asset and invest their many funds then they have on the real time investment.
Smart contracts are not based bitcoin it the ethereum oriented project. That is reason eth value grows snc being stable in the market.
.
I definitely agree that bitcoin is more an investment asset. If you look to LTC which has actually more potential than btc to be used for payments as the fees are much lower and the transaction time faster.