At home I quilt sit-down on my dsm which is the same motion as a sit down longarm. I enjoy it but have issues with space for layering. I just got back from AQS Lancaster where I took 3 days of stand up long arm quilting classes which I took to see if I would like that. It took a while to get accustomed but I also enjoyed that. I think it is really a matter of space, budget, and whether you can stand being on your feet for long stretches (although I think you can get a chair that works as well) whether you like one or the other. You should really try both before you choose.