I understand the prestige part. But spending a ton more money for the American campus experience seems. . . profligate. Especially when study-abroad exists. For example, UCL’s “econ with year abroad” course.
And using admit rate to judge a school is absolutely the wrong way to look at things. Anyway, of the 3 you listed, UT-Austin and UNC-CH would have the more prestigious b-schools. Though all 3 would be tough for non-in-state applicants to get in to.