I would pick Warwick, hands down!
I am an european student and I've never heard of Mannheim.
On the other hand I know that Warwick has great placement stats in IB and in London's financial district in general.
I personally know a couple of guys that did their BSc at Warwick and I can assure you that they have EXCELLENT jobs now.
Of course it depends on what are your goals for the long-term, I am a finance student so I speak for my field.
Which course have you applied for?
Congrats on your admit BTW
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