I don't know the particular schools in question. In general: you didn't say much about your (a) funding, and (b) post-degree plans.
If you're in a field where you go into industry post-degree, especially in fields with certification that may vary by state, you need to ask yourself where you want to live and where you'll be forming your connections. Will a degree from a MO school help you find a job in MA/VA, and vice-versa? What is each school's placement record for the kinds of career paths you might want to have?
I would think the relevant question, at each location, is what the costs are vs the potential benefits. It sounds to me, from your description, that the VA school won't provide as many opportunities as the other two. All things being equal it sounds like WashU is a better return on your investment, but then it will possibly set you up to be in a much different location than MGH or VA. I've also mostly been ignoring the "how nice are the facilities" question, unless this is something actually going to change the level of education and training that you get. Being nicer isn't really all that important, in my book. So, I think you need to know more about what opportunities each school brings, to know what might be best for you. (Disclaimer: I don't know your field or the relevant schools, but I tried to walk you through my thinking in case it helps.)
