These two decentralized exchanges have long been familiar to many people, but among them I always choose forkdeltha because it have a much higher interface speed and fewer bugs and crashes compared to the etherdelta.
Yes, that is good than the etherdelta but some people like me are using etherdelta from the beginning so they are familiar more to etherdelta and mostly stay on that exchange and sometimes on forkdelta. But because of the low volume I do not often like it. In recent times, forkdelta has moved into new domain and their server speed is also decent now. By having whatever pairs available on which exchange, we may decide to go for one of these exchanges. Having multiple options is always good as we can minimize our risk somewhat by trading in multiple exchanges.