Teaching style is no big deal, it's University, you'll actually develop your own in time anyway.
Conventional lectures with a room of 200 people watching a presenter are now pretty much loathed by a lot of medical students and have been shown to not actually be that effective (I actually like them though, plus you have direct access to the lecturer at the end to ask questions). That being said, having lots of small group work takes a lot of time table management and if the group doesn't get on it causes problems down the line. If you get some bigger personalities in a room of 10 people then it might discourage the less confident to contribute if you see what I mean.
Don't get wrapped up in case based, problem based or conventional- not everything revolves around them. The bulk of learning is self-directed and you do your own thing.
I personally would avoid any course which is essay heavy as I consider essays to be very restrictive due to the amount of time you have to spend creating them. I'd far rather be hammering anki around the clock as it gives better long term retention and many studies have shown this.
The main bonus of small group CBL type teaching is not related to the actual content itself but instead because it forces you to learn to research material and then present it to the rest of the time whilst developing leadership skills. This absolutely mimics the style of operation in many hospitals where high-level decisions need to be made- later in your course you will get to attend things like critical care ward rounds and similar heavyweight multidisciplinary team meetings where each participant brings their own expertise to the meeting. You will be called upon to do this as a doctor again and again, either talking or discussing cases with your seniors or juniors or with patients or their relatives. Your soft skills are as important as your academics and technical understanding, don't neglect them.
I know someone who attended Cambridge as a quintessential straight A student but they lasted mere weeks there before opting to go elsewhere. The main reason was that they were from a very different socioeconomic background to their fellow students and they felt they just didn't fit in as a result. That is something to consider although anyone would be rightly proud of being offered a place in such a prestigious institution.
Also consider that you will be graduating alongside around 8000 other people and you won't be paid any more money because you went to medical school X or Y, nor will your final grades make any difference to where you undertake foundation training. In fact, these sorts of things are now rapidly disappearing into irrelevance when it comes to speciality training, for better or worse.