The structure, size, and faculty drew me to risd. The studios are also way better (and you have access all summer in between 1st and 2nd year). Also the students I spoke with in the program seemed way more...focused (may not be the best choice of words, but it is what immediately comes to mind) and the general attitude about the program was more what i was looking for. Saic is a huge school, and the ta opportunities arent built into the program in the way that they are at risd. And, while i realize its frivolous and silly, saic doesnt have grades (haha, i feel ridiculous even saying that, but it was a turnoff). That being said, there were some faculty at saic that i was super excited about, and the director of the painting program is awesome.
Also risd offered a fellowship/assistantship and saic was...extremely thrifty on their end.