What's the best SIM card in Beijing?

Has invited:
In China, there are three majoy carriers: China Mobile, China Unicom and China Telecom.
All of them have 2G, 3G and 4G network. But there standard is different.
China Mobile support:
-  2G:GSM,
-  4G:TD-LTE
China Unicom suppport: 
-  2G:GSM,
-  3G:WCDMA,
China Telecom suppport: 
-  2G:CDMA1X
-  3G:EVDO
Check which your phone can support and then find a nearest shop to by the SIM card, because the price is almost the same. 
Generally, China Mobile has the best network and the most expensive price.

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