I would say Exeter has the better reputation overall, and might give you more of an edge with applying to a bank (I know they tend to focus their recruitment effort on the top few UK universities, which is not to say it's impossible to get in if you go to one of the others, but you might have to make a bit more effort :))
I guess you should also consider what suits you best, i.e. which town would you prefer to live in, which course has the more interesting/relevant content for you.