Do most students aiming for selective colleges take the SAT and/or ACT in junior or senior year?

The focus on one test or another can be very regional also. Here in Michigan it has been all about the ACT and few students would even give the SAT a shot if they had a great score. However, this year the state testing is switching to the SAT (great year to switch, with the SAT completely changing also, no one knows what to expect and the kids are freaking out). My D is taking the ACT today so she’ll be able to compare.