Short answer
Water-jet looms weave high-speed plain and dobby synthetic fabrics using water propulsion at low cost, whereas Rapier Jacquard looms use mechanical grippers and electronic jacquard harnesses to weave heavy, multi-colour zari brocade, Banarasi-style, and Paithani-look sarees at slower speeds.
When comparing silk-look sarees in Silk Plaza, Millennium Market, or Rohit AC Market, ask how the saree was woven:
Tell us what you're looking for and we'll point you to the right market or supplier.