I have just graduated from Newcastle so I'm really biased - however it is a Russell Group University, it has the best nightlife in the country and is truly a beautiful city (packed with the friendliest people in England). I loved every second of my time here and recommend it to everyone.
I don't know how Bradford ranks for Sociology - but Newcastle is well regarded and I know a few students who did it and they loved it. They were well supported and came out with good marks.
Anyone saying that Bradford is a better city/ University is lying (my family are from Bradford, I have been many times) - however specific to your course I don't know.
Feel free to PM me with specific questions regarding the place.