Its only my experience but in my world sanding swirls are typically an issue of your setup or sanding technique with nearly any sander. Things like too much sanding pressure (either by the operator or the vac), poor sanding technique, moving through grits too quickly or too slowly and burnishing the stock, etc..
I have always been able to get a quality finish out of everthing from an inexpensive 1/4 sheet orbital up to Mirka/AirVantage/Dynabrade etc. but a lot of it comes with paying serious attention (not saying your not) to the sanding but not overly so.
For sure threre can be issues with bad pad, poorly graded abrasives, orbit size, and so on but for the most part moving from any given sander to another is more an issue of speed and operator comfort to me. Small orbit finish room sanders can still work on the shop floor just fine they will just be slower.
I started sanding when I was very young with my dad's old chrome black and decker 1/3 sheet sander which was the bee's knees at the time. You'd better be able to get control of your curlies with one of those puppies.