I trade with XRP on Bitstorage exchange, the lastest exchange where XRP is listed. for now. feedbackable support, interface is common for all average exchange, smoothless withdrawals.. don't know what else
I didn't trade XRP I traded on Binance Coinbase and Yobit To me investing in these three places seems to be the simplest. I made the foremost profit by investing in Binance it's currently on.
I will find a better coin because XRP really doesn't bring much profit to investors. Exchanges like Binance have a lot of altcoins for you, and lots of good projects are listed there, so there's a lot of risk involved.
I like high liquidity exchanges because it's a place where I can buy and sell easily and don't have to worry about investing in shitcoin because if the project is not qualified, it will never be listed here.