When possible take the metro. It is very cost effective and a good way to get around a large city.
There are several reasons why we use the metro. It is not only a cost effective way to access a large city but you can save money on accommodations by booking a little outside the city and taking the metro into the city.
Metro/Trains are also a great way to get from most airports to a city center. When we flew into Shanghai we took the train/metro to our hotel (Pullman Shanghai Jing An). In fact we normally book our accommodations so they are close to a metro stop.
Check to see if your next destination has a metro. https://en.wikipedia.org/wiki/List_of_metro_systems
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