If you have funds buy them both,as they are both valuable,for long term investment ethereum is a nice pick as its value has been very stable lately,with a very solid platform like Btc and strong support from the community itself it looks like priming up for a big push this year,so i really expect its value to pump up more in the middle of the year.For ripple i prefer it as a short term or day trading coins because of its low value i can really buy it in volume and practice trading.