City!
I've never been to kuringai myself. .. but city is way better in terms of transportation, socialising.... eating..shopping.. etc.. and all the buildings are next to each other.
I guess possible advantages of kuringai is that it actauly has grass.. . and would be reasonable if you lived close to it..
Im not sure if there are any courses that are better at kuringai.. or if some courses are only available at kuringai, but i' say city is the better of the 2 by far.