Bitcoin is better than any other cryptocurrency for a simple reason that other cryptocurrency such as Litecoin and Dogecoin could hardly be used to purchase for retail commodities even if they are accepted by the dealers. And they are usually used for investment or storage value.
Omg you are right. How come i did not think this by myself. I thought second life lindens are best crypto curency. but yes out of Second life are a bit useless. It seems Bitcoin is much better.