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CMU does a huge marketing of it's CS program
CMU is lot less well known than MIT and Stanford
If you attend any session with their admission counselor, they claim they are the best in CS.
Also, I have seen there are many CS students enrolled at UIUC who didn't fall for such brand marketing by CMU and a lot of CS students joined UIUC despite being offered admission at CMU CS or Berkeley CS or both. And, I have not heard them regretting about their decisions.
I think there is a perception that CMU is best and this perception is closely related to aggressive marketing done by CMU for making it's CS program a brand of it's own.