The University of Louisville has a dual degree program that allows you to earn a MS in oral biology (No additional tuition or time required. It's completed the same time as your DDS). University of Michigan has the Pathways program, which allows you to customize your curriculum, AKA allows time for you to shadow, research, and take classes related to specialties you'd be interested in. Each school has its own aspects that make it stand out. What do you want out of your four years at dental school? Make a list and compare it to what these schools offer.
I wanted a school that placed a heavy focus on clinical skills (Early access to patients, lot's of time spent in the clinic), plenty of research opportunities and time to do it, and was involved in serving the local community as well as opportunities to go on service trips to developing countries. Which is why I decided on Michigan!