Single ticket vs 3 day pass - Shanghai Subway

Hi,
I will be based at the Jitai Hotel near the Main Railway Station.
I will be travelling from here to various places in this city - like the Science museum, Nanjing road, Nan Wai Tan (South Bund) Fabric Market, etc.
I will only be in there for 3 days.
Would it be wise to buy the 3 days subway pass instead of buying single trip tickets to each of these places?
Thanks
Regards
Ziyed