Generally the more it costs - the more options it has. I would base my decision on which options you want/need. Make a list and start checking it off. For me it was # needle positions, automatic presser foot, a handful of must have stitches - the extras were just icing on the cake so to speak, sewing area, extended table availability (now you can order aftermarket ones that fit) and dual feed (which at that time narrowed it down to one brand - Pfaff - now others have it). I, being somewhat "frugal" lol , purchased a used Pfaff Performance 2048 that had been upgraded be a dealer to a 2054.
I have said this many times - but will also say it here - which ever one you decide on - you would be happier if a dealer was nearby for service. Many of the smaller repair centers are not trained to work and service on these newer computer driven machines.