I do not understand why you need to look for differences. They are needed for different things.
In my opinion, the difference is aimed at the difference in terms of the financial return both of the coins can extend after investment. In that perspective, Bitcoin has somewhat good and strong position and of course this is just because of the demand for the coin.
The demand exist itself because of the benefits that could be derived from the technology in any way possible. There are many ways you can use Bitcoin.