I'm currently doing the Exec MBA at Imperial College while working at Accenture and can certainly vouch that it's a world class programme with an excellent faculty and students alike.The main difference to LBS for me personally was the open door policy that each of the lecturers have. It’s not just a “strap line” but is actually encouraged. Cass is geared more towards the banking sector whereas Imperial provides a wider and more diverse student base.As mentioned previoulsy, it ulitmately depends what you're looking for. Hope that helps…