Both have a raised texture, but the structure differs. Pique has a small honeycomb or diamond pattern on the face only, with a smoother back. Waffle forms a grid of deep squares or pockets, visible on both sides or on one, with a much more three-dimensional look, more thickness and a greater ability to trap air.
Pique is the classic choice for polos, waffle for loungewear, pyjamas and thermal pieces. In both, tuck stitches pull the fabric in, so always check the real finished width.
piquewafflecomparison