I think in general quilting machines have a larger 'harp' - the bit to right of the needle so you can get a large quantity of material through it. They sometimes provide them with an extension table, to support more weight of fabric. Sometimes they supply them with a walking foot as well. I had a Pfaff Performance 5 and have to say that I personally didnt get on with it particularly well, and sold it to someone who loved it. The do have a lot of 'embroidery' stitches, but are not an embroidery machine per se. You can make up your own stitch patterns with them, but it requires the patience of a saint! If you want a sewing and embroidery machine combined, the Brother V5 is a good bet.