Say if I were to apply REA/ED to one school out of Harvard, Yale, Stanford, Vanderbilt, Columbia, UPenn and Brown. If I am genuinely happy with any one of these, which one seems like the most favourable choice in terms of acceptance? Keep in mind though that I am an international student with a 32 on the ACT and a 3.83 UW GPA. Not applying for financial aid. Excellent activities at national/international levels. How will the current situation affect my admission? Any input will be appreciated.
All of those are reaches and your ACT is at or below the bottom of the middle 50 for all of them (25th percentile is either 32 or 33 at all). So given that chances are low everywhere, and lower as an international in most cases, the only reasonable answer is to apply at the school you most want to go to. Your chances are not going to be appreciably better at any of them vs the others.
Your other thread says you have lower ACT and GPA than this one by the way.