Whose is the best? Major domestic electronic map companies big competition

Chatting with friends a few days ago, I learned that the recent electronic map search has been hot, like GOOGLE, Baidu, and gradually become an indispensable part of People's Daily life, whether it is going out to travel, shopping, food or business activities, everyone began to consult the route, surrounding locations and other content through the electronic map to facilitate travel. To this end, I seriously understand this rising and so convenient industry for people, below I only from the usability of maps, operability, accuracy, the beauty of the map itself to look at Sogou, Mapbar, 51ditu and Mapabc, which of our commonly used maps is the best