the rankings only matter to the extent that you'd rather go oxbridge/ucl/imperial over liverpool but even then their overall scores on ranking tables are so tight. In the middle it's all a blur tbh.
Really you should be looking at how each course is taught, like PBL or non-PBL, integrated or traditional. And perhaps also whether they offer intercalation.
Despite the fact oxbridge is notorious for their relative lack of clinical experience until late in the game I was dying to go to Cambridge for the university itself (so probs being hypocritical there) and the fact there is a huge emphasis on research in the Medicine course there.