I personally like having a circulation pump but I would not base my shopping process on whether one brand has one or not. Marquis does not use a circulation pump and Caldera does on their Paradise and Utopia series, but not Vacanza. Premium Leisure is not in the same league as Caldera and Marquis and should not be compared or at least done so with the knowledge that they are not equal.
One pump, two pumps, etc should be determined by how many jets, size of jets, and how efficiently the hot tub is plumbed. Which models are you looking at from Marquis and Caldera?