I use to use spares only.... but the last few times I got them, they were mostly all fat, and according to my meat tasting judges (family) the flavor was just fatty, no real meat flavor....
So, I started getting baby backs from Sam's Club. They have, so far, done me good. I have only had one rack out of probably close to 30 so far that had a broken bone in it. These ribs are also what I used to get 1st place a couple of months ago in a near by ribfest.... so, for now, I am sticking to them. It did take a little getting use to cooking them when I switched, but now I have them down pat... and believe this one or not, I cook them 5 hours.... and they have had great reviews by everyone that has had them.