have you visited both campuses in real life? and which college did you apply / are you planning to apply to at ual?
i previously applied to ucl's slade and ual csm, for ual's csm you must have done a foundation year (doesn't have to be at ual). they don't officially state it but they rarely will ever take in an a level student. ucl's slade is pretty similar, their art course/ department ranks as one of the most competitive departments to get into, so i'd recommend doing a foundation first if you're set on joining only ual's csm or ucl. other than that you could go for other ual colleges.
for fine art usually people will apply for chelsea college of arts or camberwell (and central saint martins). chelsea is more known for graphic design and fine art with a very open course; im doing fine art at chelsea right now (ask me any questions related to chelsea if you're interested!) but keep in mind photography isn't a huge thing here and in my opinion the facilities aren't that wide range. for me a big thing is that the studios don't have lots of natural light, i just dislike the building lol (so make sure you view the studios of each uni, it's important and can impact your work ethic loads) most people i know like to stick to traditional mediums and some with video or performance art. camberwell im not too sure on but i've visited their campus in the past and know someone in their fine art: painting course. both of our courses are quite loose, we don't get briefs so consider what your work ethic is like - do you need guidelines, will you feel lost without given briefs? or will you feel more freedom and experimental / ready to just start making work when you enter your studio?
to summarise:
central st martins (csm) -> fashion, fine art
chelsea college of arts -> graphic design, fine art
london college of communication (lcc) is more digital oriented (marketing, game design, photography)
london college of fashion (lcf) -> fashion
i don't know much about wimbledon, sorry
to note i got rejected from ucl's slade and csm ( didn't realise i needed a foundation for csm) - i really liked slade's studios, they are massive and get so much natural light, but ual's reputation is strong standing, if you're an international student, ual is well known for its rank. then otherwise if you care about russell group etc ucl is good as well