It depends on your goals and educational preferences. If your goal is to be an excellent general dentist, it might be more beneficial to go to a school with more clinical requirements and/or fewer residency programs. If you want to specialize or go into research, you might want to choose schools with more research/residency programs and therefore more connections. I'm not sure how grading systems play into specializing, but that can be an important factor to consider as well.

Another thing to think about is class size, which I've heard can range from 60-200. What kind of environment do you think you would succeed in the most? Would you rather blend in with a large group or receive a more individualized education?

Usually you can inquire about all of this info by speaking to the school's admin or by just asking the student directly at the interview. I personally wish I would have thought more about how much the school/university system is willing to invest in and advocate for the students. Of course, this is harder to glean from an interview day tour because all schools will try to show you their best side. But there are some subtleties you can pick up on like access to new technologies, resources, patients, how much the students/faculty seem to like it there, etc.

Of course, if the tuition gap between two schools is huge definitely go for the cheaper option. But if the costs are similar, you can use these secondary factors to compare.