I've heard yes and no on this all expansion, it would be nice to know the real scoop.
You will without a doubt take less damage using SD but there is also a greater chance you will die. Personally I use SD most of the time so the healers can concentrate on healing the raid, but those infrequent times where I feel there is a chance I could die I use FR. If it's something predictable you can do both if your rage generation is high enough. Get up a 10+ second SD and then bank rage for FR.