I assume you have wet tested both? If no, do so before deciding. If you have then you should be aware that the jets feel quite different. The Caldera uses smaller nozzles with more force, and they give a tingling kind of feel. The Marquis uses larger jet diameters, but with more water flow from their pumps to give a strong pressure that perhaps goes deeper into your body. Only you can decide which you prefer. Both have similar very high quality.