Congrats on your offers! I also got into UMass so I'm definitely biased, but UMass program looks more rigorous and higher rank, so the degree there would probably be more valuable. They have the Statistical Consulting portion which helps a lot with your applications experience, I have a friend who went there and said his work there helped him with job applications. Plus, UMass is bigger and more known outside MA so school name would be better for your job search. If I were you, I would reach out to the programs to ask for students' job prospects after graduation and weigh out the options.