Hangzhou without a doubt. Food is good. I like Hangzhou's botanical garden, West Lake, the "tourist traps", the many pagodas, temples and museums. I like tea, which is celebrated like a deity here in Hangzhou. Transportation is excellent (lots to see during my days off). Bunch of universities and high schools (lots of students to tutor). I would definitely go for Hangzhou as Nanjing does not inspire me (but that's personal).