I am in catered but I will give you a ranking according to what I hear from other people.
1. Park group (mackinder, stenton, childs). These are so nice and modern with double beds and ensuites and they are on campus but they are very expensive.
2. Benyon (ensuite). Apparently these are quiet halls. But I can see in them from my room and it looks really nice. Also there is a pretty pond and stuff.
3. Sherfield (ensuite) my friends say it’s alright aha. (Benyon and Sherfield are right next to eachother, it’s about a 15 minute walk to the centre of campus)
4. St. Georges/Wessex - I really don’t know much about these. Apparently the rooms in St. Georges are really big. Wessex is on campus which gives it plus points.
I know there’s a new hall opening in september called bridges, which might be worth a look. It’s also on campus. Hope that helps :)