I would suggest really sitting down and looking at the courses, because if you don't like how you are studying, what you are studying and how you are examined on it, you really won't enjoy yourself.
Bart's has a good name because it is a London school. Peninsula does things very differently and is making a name for itself by churning out technically brilliant, capable foundation Doctors. We don't have as much hard core science teaching as other places, we're much more clinically orientated, everyone is very friendly, there's loads of opportunities to see things and get involved with stuff so I don't think you'd be disadvantaged by not being in London. Loads of our lecturers come from London because they prefer the ace of life down here. Some people really don't like the lack of science lectures, it's much more teach yourself orientated. That's not necessarily a bad thing, but do you have the motivation to do it and is that how you learn best? We make up for it by doing a lot more clinical stuff early - things I have heard 5th years at other places worry about passing competencies on we can't pass into third year unless we can do well. Also, having done a degree where the exam style really wasn't my strength, I love these applied medical knowledge tests - multiple choice, negatively marked, set at junior Dr level so you aren't supposed to know all the answers at my level, not very easy to revise for since it covers such a broad spectrum of topics. Some people really worry that they aren't getting essay questions and writing papers on each of the different core areas of medicine like the pharmacology, anatomy, physiology, microbiology etc. It does frustrate me a little that some people just guess all the answers and get more marks than me, but I at least know that my mark truly reflects my knowledge. Equally, people don't like that we don't do dissection or pro-section, but the facilities and resources we have available to us are outstanding, so I honestly don't think it makes a difference. We have Aclands video's on-line so you can watch dissections of a particular area with commentary and labels over and over, we have lectures that talk through the anatomy, we have life science sessions where we see the anatomy on plastic models, life models and draw it on each other and then clinical skills where we feel and test the anatomy as part of systems exams. You really do get to build a picture of it from all different angles and sources in your mind. In my opinion, far better than a dissection you can cut/observe once.
That said, I don't know how Barts do things, but I know that Peninsula is the school for me and I am so happy I got a place here. It fits my learning style perfectly and I picked this place from reading about all the different schools when I first applied. I also know people who were left with this choice as their only offer and complain about bits because they don't really want to be here. So congratulations on your two offers, which one suits you best?