XRP its a centralized cryptocurrency with a unlimited supply, their ecosystem controled by bank. Imagine that with an unlimited supply, and only the company can mining/created the XRP. Better to use ETH.
Yes, it is really strange to compare ETH and XRP... May be the question is not which platform is better but which token is better? If so, ETH token is much more useful than XRP because XRP is 100% useless =) Ripple platform can easily work without XRP token but for some reason people don't understand it and buy XRP. They will lost all theie money some day. Don't follow them.