A dividing head can cut curves,too,but the faceplate on a rotary table is more rigid. I have 3 rotary tables,but my original 6" one is just fine,and I can increase its faceplate's size by bolting on a larger plate of metal.
Probably Enco,especially,has a decent low cost table. BUT,if they offer a set of index plates and a tailstock,I'd get them,too. Asian stuff has the habit of changing,and you can't get parts.