Not Pharmacy but biomed, so quite similar - I faced that choice several years ago and decided to go UCL and I am so happy I did! Its more diverse, offers more choices of modules, better professors in terms of their expertise and extremely amazing atmosphere and feeling of belonging. Today I am a year after graduation, and honestly when I met friends who went to King's for bioscience course they complained a lot about the campus (because it's on the other side of the river and is really not pleasant, been there once) and their professors, poor teaching and often they went to UCL parties and events because they didn't like the social scene in their uni