I'm in China and my Chinese wife uses several of these apps but they are battling pretty hard and she changes her app preference fairly regularly. Currently she's alternating between "Yihao zhuan che" (http://www.vvipone.com/) and "Didi da che" (http://www.xiaojukeji.com/). Yihao has several different upgrades like "fast car" and "dedicated car" which can pay more for quality. While Didi is more taxi grade and does car pooling with lower cost options and delivery driver services. Didi is also doing a lot of promotions like "free Mondays" which free is fairly bloodbath pricing.