I have worked for 12 years as an architect in Sweden and I’m looking for new possibilities after a MBA study. I want to either get into MBB in Sweden or into real estate.

I am only considering online MBA at this point. Which one is better? Imperial College or IE? Is IE really more highly regarded than IC? IE’s full time MBA is ranked lower than IC on FT actually. But apparently many people think IE is one tier higher than IC?

And how is online MBA regarded by MBB? Is it not as good?

I don't think an online MBA will lead you to an MBB job. It's simply not going to happen.