Ripple prices are more stable now than Bitcoin and Ethereum, however Ripple has experienced a number of increases if you look at the chart. But I think if the price of Bitcoin rises then the price of Ripple will follow up, so if you want to buy Ripple it's not a bad choice right now.
Read this article, very interesting if it's Ripple More Decentralized Than Bitcoin and Ethereum,
https://news.bitcoin.com/ripple-believes-its-cryptocurrency-is-more-decentralized-than-bitcoin/