Anyone who makes their choice of university solely on the basis of 'prestige' - however you choose to define and measure it - is asking for trouble. The most important thing is: which course matches your interests and preferences better?
Out here, in the real world, most employers don't care which university you went to. They have no clue as to whether KCL is better than Durham or vice versa. They're just not interested. They may, however, care a lot about what degree classification you got, and you will do better if you enjoy the course content and the style of teaching suits you. If you hate the course, you are unlikely to do well. Dropping out can be even more unhelpful in terms of your ultimate job prospects.