Hi,
With regards to your question, I would take CASS over Manchester. But I am a City grad, so I'm inherently biased.
As a secondary point, and forgive me for piggybacking on your thread, but I too was looking into doing an MSc in Management. However, given the costs involved at the top institutions (CASS, Imperial, Manchester etc), I am begining to think whether it is worth it? MBA costs are prohibitive, but there is a tangible benefit in doing one. An MSc in Management, on the other hand, is only marginally cheaper but doesn't have the same gravitas? Would you agree?