Scroggs has hit it on the nail again.
I have used OAT notes and I have read the Bristol notes. Both very good. Some subjects at OAT are better than Bristol and some are better at Bristol. The feedback is all the same as the students tend to get there hands on everybodys and the staff copy it. There is differences of opinion though about what some of the answers are.
I would make your choice purely on a money choice between the 2.
Cost of the course.
Local acc charge for the 2 week residental parts.
travel to get there.
Add everything together and go for the cheapest.
The only reasons why I went to OAT was because they didn't charge me for sending books to Germany and it was easy to get a bus from LHR to Oxford.
MJ