Pigment ink must be used with cotton and cotton blends, and you can 'feel' it on the front of the shirt, though Jetprosofstretch paper is helping redefine heat transfer products with a soft hand and color retention. Subdye doesn't have any hand but needs polyester as it won't work with cotton. This limits your shirt selection of shirts - but - with a press with attachments - opens you up to other products like mugs. I don't have experience with washability, but understand it holds color much better than pigment ink. The inks for subdye are more expensive. If you go to one of the suppliers listed here, you can check out prices for supplies for both products. Hope this helps you start your research.
Dye Sub or Pigment Inks 
