Ripple is the best stable coins , but is not my favorite either . Bitcoins and Ethereum is my favorite currency because price can go up and down. And such movement brings profit and loss if you know how to enter and exit. Monero is also a good currency for its anonymous nature and once bitcoin and Ethereum is down, I switch to it.
If someone is really after stability, much better will be to go for gold. This is the reason why ripple is losing interest of people and other more volatile crypto coins are getting attention of investors. Crypto currencies are famous for their volatile nature. Nobody wants to see stability at the moment. This way, it would be almost impossible to make big profits from investing here. Bitcoin has the largest community of investors only because of its volatility and growth rate.