First off, Oxford's price is 2700 GBP, while Bristol's is 2140 GBP. As far as I can tell, both include distance learning CBTs and ATPL manuals (or text books). I have Oxford CBTs and they're pretty good, but have only seen only demos of Bristol's.
All in all, 560 GBP is not an insignificant amount of money given both programs are pretty much the same. I'll probably go with Bristol.