basically, the city campus is what used to be UMIST, so even though they are both run by he same accomodation people mainly umist students went to those halls. not sure how much this has changed with the merger, but chances are unless you are doing a course that would have been a umist one, most of your lectures would be in the south campus area, which is probably equidistant between fallowfield and the middle of town. fallowfield really isnt that far from uni, it takes me about 45 minutes to walk from the far end and i have short legs. and there are hundreds of buses a day, while there dont seem to be taht many in the city centre campus area. also in fallowfield you have sainsburys, all the delighful student pubs and clubs and probably no one over the age of 24. which is great if that's your thing. i didnt live in the city centre halls so i dont know for sure, but to me they seem a bit isolated, and the only good thing if you dont go to umist is that all the shops are around the corner, which isnt really a bonus when it comes to credit card abuse. also you donthave a decent supermarket like in fallowfield which isnt great if you dont have a car.
i was in canterbury court which is self catered and en-suite and it was pretty good, large rooms, quite modern, cleaned and so on. this is in the victoria park area, which is closer to uni than fallowfield, about a 20 minute walk, but there isnt really much around in terms of shops and so on, only a grotty-ish pub, tesco express and a turkish store. but nothing is a million miles away and its a decent alternative from fallowfield. richmond park is very nice, very attractive from the outside and next to all the sporty business. also there are so many other halls in that small area that socially, i would imagine it is great.