Keep the Bernina. You might decide to try crazy quilting and will want the stitches.
I tend to use my Juki exclusively, but I can also piece on the Pfaff 2170 if I have the Juki set up for FMQ.
I've also used a serpentine stitch on the Pfaff for narrow sashing. Repair stressed areas of quilting with zig zag stitch.