I collected over 30 different masculine flannel fatquarters. Spent an afternoon serging all the raw edges. Tossed them all in the washer then dryer. Did noticed some of them twisted? a little. I'm just using them to make a D9P/window pane pattern from MSQC. I'm just making sure that I don't stretch the fabric while piecing and square up a lot. I bought some Moda flannel for the back and also for the window pane strips. It washed up beautifully and feels wonderful and thick.
So, I have no problem recommending Moda flannel. Don't know the names of the fatquarter flannels that I bought but I did buy them at various quilt stores.