Doogee DG310 vs KingSing S2

Both phones were purchased from www.Coolicool.com. Here are the links to each phone:

Doogee DG310:

http://www.coolicool.com/doogee-dg310-voyager2-mtk6582-13ghz-quad-core-50-inch-854-480-ips-screen-android-44-3g-smartphone-g-33756

KingSing S2:

http://www.coolicool.com/kingsing-s2-mt6582-13ghz-quad-core-50-inch-screen-android-44-3g-smartphone-g-33873