It depends on how much you want to spend. It is a lot cheaper to buy digitizing software to create your own designs then transfer them to your machine rather than buying a machine that you can create designs on and stitch it out.
I have a Bablylock Destiny2 and you can create designs with it and stitch them out too, but it costs about the same as a small car. I don't use it to work with designs...create, resize, change color, set density etc....becaue I prefer to use the big screen on my computer's monitor so I can see everything as large as I want instead of the small sewing machine screen. I also find the computer software is easier to use the computer in the sewing machine. I use EMbird's software, but there are many others out there.