I would decide on the basis of the course tbh. The campus of Leeds is really nice but apart from that there is really nothing special about the city. Apart from a few streets the city centre is rough and pretty grotty really and there are huge numbers of chavs everywhere like in most of the north. Hyde Park where the students mostly live is your traditional grotty student area with litter, weird people hanging around and run down terraced houses, Headingley is a lot nicer but expensive, it is also loud, full of drinkers and if you don't like pubs pretty boring really. There is also Woodhouse Moor where everyone hangs out in the summer which would be a nice park if it weren't in such a bad area.