I've been facing the same issue! I've gotten into some great programs, I'm still waiting to hear on one more. Some things I've been taking into consideration:
1. Incoming Class Size - Is your incoming class 1,500 or 200 students? Depends on the program. In addition, I'm curious about class sizes in courses (15 or 30 students in a classroom?)
2. Location - Where do you see yourself spending the next few years? Where do you want to practice social work? If you want to do work in Los Angeles, Chicago might not be the best place to get your MSW, as you're building your network out there during your program. (This isn't to say you can't always move afterward, but there are things like licensure and hours if you're working toward an LCSW that you need to keep in mind as you move state to state.)
3. Field Placements - What opportunities will you have for field placements? Universities in big cities/metro areas will have access to larger organizations and resources. Most programs are seemingly private about the actual names of organizations they affiliate with for field placement, but most field placement offices will give you an idea if they have opportunities available in the area you're looking at.
4. Professors/Research - Find a professor you think you'd want to study under, read an article by them, and get in touch. Most professors I've found are more than willing to chat if they can make the time. Some questions to consider: What are the professors researching? What is the program putting funding into as far as research/initiatives? Are there opportunities to engage in professor's research if wanted?
5. Student Body - What are your peers like? A lot of state schools attract a more diverse population, racially/ethnically, along with age and experience. Some bigger institutions attract more of an international population. Try and learn more about the students!
6. Courses - The more I've come to see it, most programs are fairly similar. Every program I've seen has a first-year generalist approach. Then some continue in the second year with that generalist approach or there are specialization tracks. Talking to my social worker friends, they've said these specializations have rarely been defining factors. Rather, they've said that their experiences from second-year field placements were much more impactful on their skillset than the special courses. But if there are courses you see in the catalogs that interest you, something to take into account.
Hope these help!