Bitcoin is the main one with the pushing power behind it and support. Bitcoin is thee digital currency and all altcoins compare their value to it since it is what people want most because they can spend it.

Lately more and more altcoins have other uses including paying for video games and vpns and Eben website hosting and domain hosting. The more backing the better. The better a coin is the more you can buy with it directly. We need more coins to support direct payments so we have something other then bitcoin to make purchases. The extra transactions will do the coins good.