Both seem like great options for you - Congratulations!
My understanding has always been that for positions in academia, the reputation of your Ph.D. granting institute is really important. This is coming from the perspective of another prospective Ph.D. student, with knowledge just based on conjecture, for what it's worth.
With that in mind, I would say try to figure out where you would fit the best and have the most success. Personally, as an introvert, I would prefer a smaller program to be able to maximize my interaction with the faculty and other students instead of feeling lost or overwhelmed in a large program. It also sort of comes down to who specifically is doing research that interests you most and again maximizes your chances at success. Maybe find a couple of people you are interested in working with and reach out to them to gauge general interest? I am not sure if these programs have lab rotations, but that will be a great time to test out what it is like to be in a lab with a potential advisor after you choose which school you're going for.
If anyone has any corrections or expansions on this short (hopefully helpful) advice, feel free to add!