Personally, I would buy an etherium. As for me, this is a more promising coin than ripple. Especially since the riple in the summer there were some misunderstandings related to the developers and the number of coins from these developers. Therefore, the etherium is unequivocal.
Even ripple is better stable for long time and you can understand that if you check the price chart. We have to get the coin in both list means you have to go with the ethereum only because its value would be higher than ripple and it is the next coin to bitcoin as well.
If you looking safety coin to have your fund for long time you have to go with the bitcoin or other decentralized currency. These both the altcoins are centralized money and it have the control on them not like bitcoin or so on currency.
I see ripple is more like a company compared to ether. That's why they tend to provide profits to its holders in this crypto market. Ether's developers are like they don't care about slow transactions.