Why do I think I would prefer IB? From what I have read, and from what friends who work in IB have told me, it seems to align with my interests and expectations nicely. It is well-paid (potentially far more so than the ALDI job), prestigious (certainly more so than the ALDI job), exciting and dynamic (probably more so than the ALDI job) and you are surrounded by lots of the smartest young people in the country which makes for an exciting atmosphere.
I feel that a lot of people will be put off by working for a (seemingly) boring and unimportant company like ALDI - hence the disproportinate wage-structure, which - in my opinion - is used as a form of compensation to entice good applicants who would otherwise be apathetic/disinterested about/in working there.
I think that you wouldn't get the same levels of excitement and satisfaction at ALDI, because the atmosphere and work are so different to those at an IB. That said, I don't have any experience of either so it's just my opinion.