Just looking at the daily trading volume:
Ethereum(ETH), Ripple(XRP), & Litecoin(LTC)

XRP~
Is making its presence known in current markets, I am still looking into the details at this time, but from what Im understanding may not have to potential of the later "LTC or ETH"

LTC~
Is equivalent of silver, if Bitcoins were equivalent to gold, and from my understanding has already proven this to be the case.

ETH ~
Is being adopted by retails that already except bitcoin, and from my understanding caught the eye of several UN humanitarian organizations, which is interesting.