hey, my friend is a final year med student at barts and she was in this exact position 6 years ago. when I asked her how she chose, she said that barts was better suited for her because it is PBL, whereas kcl is not. she also said barts is known for their student life and that also convinced her, although everyone has different preferences for how they wish to spend their free time. finally, she said barts has clinical interaction early on compared to kcl. obvs your UCAT score is the most important deciding factor, and barts operates on a 50:50 with grades and UCAT, whereas kcl is more holistic but still require a high UCAT. hope this helps!!