As pointed out above, Oxford has several advantages for those whose strengths play to the tutorial system, intense workload and enjoy that kind of ethos. However, if you want to have a future career in psychology don't overlook the advantage of that placement year can bring to your plans after graduation.
A year as an assistant psychologist in a clinical setting will definitely open doors in the future if you want to go down the clinical psychology route, or a similar placement in a relevant psychology setting will give you that all important experience most professional psychology careers will demand. It would be hard to replicate that in Oxford, mainly because the workload is so high which doesn't give you a huge amount of time to find a placement and work through it, and Experimental Psychology doesn't have a huge focus on applied psychology settings that Bath has and you would have to find this yourself afterwards if you wanted it.