Which is better for STEM reputation: University of Illinois Urbana-Champaign or University of Michigan?

The biggest practical tradeoff is breadth versus balance: UIUC is especially famous for engineering and computer science, while Michigan pairs very strong STEM with a broader across-the-board national brand that can feel a little more evenly recognized outside technical circles. In pure STEM reputation, UIUC often gets the louder reaction in fields like CS, engineering, and certain quantitative areas. Michigan is still highly respected in STEM, but its reputation is often discussed alongside its overall prestige, research scale, and strong professional schools.

If your question is specifically about STEM reputation rather than campus life or admissions odds, UIUC has a slight edge in the most technical areas. That is especially true for computer science, computer engineering, electrical engineering, and several other engineering disciplines where Illinois has a long-standing reputation among employers, grad programs, and people already in those fields. For students who want to be surrounded by a very STEM-heavy culture, UIUC often feels more identified with that strength.

Michigan, though, is absolutely not a step down in any broad sense. It has excellent engineering, strong science departments, major research activity, and a name that carries very well nationally. In some settings, especially outside tightly technical conversations, Michigan may be more instantly recognized by the general public because its overall institutional brand is so prominent.

So if you are comparing only STEM reputation, I would give the nod to UIUC, especially for engineering and CS. If you mean overall academic reputation with strong STEM included, Michigan makes a very compelling case and may feel slightly more versatile as a brand. The difference is not huge enough that applying to one and not the other would make sense solely on reputation grounds.