Well, with dye sub, you can only print on products with polyester (like 50/50 t-shirts or polyester coated products).
So the types of garments you can use with dye sub are different than those with heat press.
The feel of a dye sub printed garment is also different than a heat pressed garment (with dye sub, the ink blends INTO the fabric so you can't feel the design if you run your hand over it -- heat press is pressed on top of the garment).
You can find lots of good information about dye sub at www.dyesub.org as well.
A forum community dedicated to T-shirt merchants, professionals and enthusiasts. Come join the discussion about graphics, commerce, dyes, prints, collections, guides, displays, styles, scales, equipment, accessories, reviews, classifieds, and more!