Jen since I use my crystals on things that will be going through the wash I trust the Swarovski more. The glue is more reliable, at least on the one's I've purchased. When I started embellishing clothes, I used the cheaper glass crystals. My middle daughter is my guinea pig and well, her clothes get washed 3X's as much as anyone elses. The glass crystals are only half there, the Swarovski's have not fallen off yet.
I do tell my customers to wash inside out gentle and dry low but me, I'm not as gentle!