I've always used the Quilters Dream because that's what my LQS carries. Recently, I've been using Warm and Natural Cotton. I like it so far. I got some Mountain Mist on sale at JoAnns. I did not like it at all. It was patchy and scrawny! I actually bought a king sized batting and planned to use it on several baby sized quilts, but ended up using the rest of it for a non quilting project because I disliked it so much.
I purchased some Hobbs Wool and am looking forward to trying it. I'd originally planned to buy a roll once I knew what I liked, but maybe I will just keep buying batting to fit the size of each quilt. I did not think batting would take so much thought!