I have tried both paper piecing for Foundation .... and Muslin. I still prefer Muslin. It doesn't stretch the blocks out of shape like paper, and the blocks go together better.
I recently made a wall hanging of flying geese and actually tried both methods. My Muslin Geese were sooooo much better.
I know a lot of people who use paper, but for me the Muslin is the best bet. You can also run the Muslin through your printer. I have found you need to allow some space on the Muslin where it first goes into the printer then it prints perfectly!
Good luck!