each one has their own purpose.. at least in theory...
Bitcoin at least has been used as an actual currency, with people taking it as payment and some businesses even accepting it (both online and brick-and-mortar). But I have yet to see any "Ether Accepted Here!" or "Now Accepting Dash!" signs anywhere.
this isn't a good measure.. bitcoin wasn't accepted anywhere at the start, and only now it's starting to be accepted in a few places. Maybe some day we will see other cryptos being accepted too.