<p>Well I can't speak for UW, but Purdue and UIUC both have large Asian populations, especially in the engineering areas. Personally, I am a senior at UIUC in mechanical engineering, and I love it here. It is also a fairly diverse population in the department (though less so than the likes of ECE).</p>
<p>I chose this place over Purdue and Wisconsin, seriously I believe everyone who got into engineering at UIUC got into Purdue as well, and I have never seen anyone who chose purdue over UIUC for engineering (There might be though). There are ALOT of Asians here, especially Koreans.</p>
<p>Technically, Purdue is better than UIUC at aerospace engineering, though that is arguable. Personally, while I feel UIUC is the better school, it is not by much, and you will get a great education regardless of which one you pick. Go visit them and pick the one at which you feel most at home.</p>