Interesting post. I have never really thought about how much the batting would/could shrink and just used whatever I wanted to, although I have never used the ones you have mentioned. I am not a pre-washer of my fabric, so I expect shrinkage and always oversize my expected finish by 6 to 8 inches (bed size) 3 to 4 inches (throw size) to allow for the shrinkage. I'd make a throw and quilt as you normally would and test the finished size after washing from the finished sewing size. This will tell you how to make adjustments for future projects to get them the finished size you want. I suspect that if you are making complicated blocks, think paper pieced, you might would want to use a batting that doesn't shrink as much, but you won't know until you test the new batting.