I still use the Brother that I have over the Pfaff I have because of the ease in using for embroidery. I love my Pfaff for sewing, but I still use my Brother 1500 for a lot of my piecing, because it is such a workhorse... My Pfaff 7570 I keep because it has a ton of different stitches and sometimes I just like to play with them.
We all have different reasons for using the machines that we do, and we are extremely lucky to have the choices we have... I have a friend who only uses Janomes, and I have never sewn on one.