Haha thanks, although it's technically my job when I'm in uni which is why I know so much :P
To be honest, any hall that you end up in you will love. You will defend it against all others for the entirety of your degree even if others think it was a bit rubbish. Either way, you don't spend all that much time necessarily in your hall apart from meals and sleeping, there's plenty of places to go on campus.
Generally speaking (and this is in no way me choosing particular halls), people tend to prefer the older halls (Hu Stu, Cripps, Lenton & Wortley, Lincoln and Derby). They are more aesthetically pleasing overall and slightly more centrally located but the rooms types themselves don't vary all that much across the campus. There are no 'bad' halls, just less preferred ones and the other halls are by no means bad. They're newer purpose built accommodation that is mostly en suite, it's easy access to the gym and they have a range of cafe and bar type facilities nearby.
However my heart will always belong to Cripps (and it is the best hall)......
Do feel free to ask any other question that you have, it is technically my job and I'd rather you ask than be left wondering!