Ethereum is really a good choice, and it has shown that it is not showing down anytime soon. Other coins and altcoins on the Ethereum block chain are doing well too.I would go for a ethereum as its pricing is premised on bitcoin price movement. price of Bitcoin has already moved in leaps and bounds today, therefore we expect that of ethereum to follow suit. Ripple is a cheaper option but then bitcoin is also not looking bad and it's only good for the long term.
But Ripple is a bit risky, with the lawsuit it has now.