I would go Fletcher. It has a more wellknown program than SIPA. Also the second-year SIPA fellowship is uncertain, and Fletcher is offering you more funding in the first year (I suppose it can be renewed in your second year). I went to SIPA ASD and was a little disappointed. They were basically selling out the SIPA and Columbia's brand. The info sessions for policy concentrations were pretty vague. I didn't find any useful information in their ASD. SIPA also seems more impersonal to me compared to SAIS, and it seems more so compared to Fletcher.
Got accepted into SIPA, SAIS, and Elliott, still waiting for GT, but probably not going there. I'm choosing between SIPA and SAIS. Congratz to everyone who get accepted!!