As I’m sure you know, according to https://www.amstat.org/asa/files/pdfs/OGRP-USNews_StatisticsRankings.pdf Texas A&M is ranked slightly higher than UMich, but they’re essentially the same. The real answer is that you should choose based on research interests. Another thing to consider is total time to completion, working at Microsoft research for 2 years after finishing a PhD in 4 is better than masters + PhD in 6, especially if you’ve already done a masters in Stats / Math beforehand. that’s just another reason to just going for the guaranteed Texas a&m PhD and finish in 4 years! Good luck!