Hey, I have actually been a student at both Edinburgh and UCL! Edinburgh was my dream uni and I was so happy when I got an offer- I went there for my first year, however I withdrew and then I started again to study a different subject at UCL.
Edinburgh is a really beautiful city I don't know if you have visited before, but living there is very different to just visiting and I did not like it as much. Maybe it's just me but there were lots of things you don't notice until you live there, it's so cold all the time and quite dirty compared to other cities omgg! You also have to be careful of the student accommodation you choose bc there were some issues with mine and my friends also said they had problems with theirs. The university campus is really nice with most buildings close together, and also lots of cute cafés and things to do nearby, and the library is also big and has books on everything. I did not study biomedical sciences, however my subject was very different to when I had taken it at a level and different to how it was described on Edinburgh's degree specification, and I did not enjoy it as much. However, I loved that you can take elective subjects and the subject I chose as my elective was the one that I am now studying at UCL! I withdrew from Edinburgh partly bc of these problems, however I had some other difficult things happening in my life (personal things) soo not just because I didn't like it bc I have friends who love it there. I much prefer UCL, I like London more than Edinburgh as a city, and the campus is also nice it is not too spread out actually as most buildings are in the same area. UCL also has better places to study and chat with friends as Edinburgh was always so busy, there was no space to sit or find a computer anywhere. I think that my course is more interesting also, and my lecturers seem to care more about the subject and the students, and I don't know if you will need it but student support at UCL is so so so much better than at Edinburgh!! -but I know that student accommodation in London is soo expensive if u are not living at home.
I really hope this is useful, lmk if u want to know anything else xx