BYU easily...as fitting with Provo.
Texas A&M is pretty conservative though. It originally required military training for its students, and it still has many ties to the military. And its student body is heavily dominated by white evangelicals. Plus, it
is Texas.
I think the kind of conservatives you'd encounter at Texas A&M are more emblematic of contemporary American conservatism than those at BYU-even though BYU is obviously extremely conservative. I guess it depends on who you see as more "conservative": Southern white evangelicals or Utah Mormons.