Hi, I'm also applying to both schools and considering both of them. Thanks for the link to the SIPA Morningside.
I met with a professor/department head of the concentration that I am applying for at SAIS and he's soooo NICE and I happened to have 2 coworkers who went to SAIS and currently attending and they both loved it. Plus, it's much smaller compared to SIPA (am I right?) like the language class have less than 10 students so that you can really gain proficiency.
I tried to go to SAIS website to hear if they have something similar like the SIPA Morningside, but still have no luck. Let me know if you find one. But, for me, I think the financial aid will make the biggest difference, plus I'm already in DC. And SAIS has the concentration that I want, which I don't think SIPA has. But, I haven't heard from any of them.