My main machine is a 1939 Singer 201. I use it for just about everything. For FMQ, the Singer 15-91 is my go to machine. For carrying to class, the Featherweight can't be beat. When I want other than straight stitch only, I dig out my mother's late-'60s White, which has a full set of cams for fancier stitches. For really fancy stitching, there is my embroidery/sewing machine, a Singer XL-400. I would find it impossible to choose only one of my machines to keep. I love them all, and I haven't even listed half of them.